ISO/IEC 24775-4:2021
(Main)Information technology — Storage management — Part 4: Block devices
Information technology — Storage management — Part 4: Block devices
Thie ISO/IEC 24775-4:2021 defines an interface for the secure, extensible, and interoperable management of a distributed and heterogeneous storage system. This interface uses an object-oriented, XML-based, messaging-based protocol designed to support the specific requirements of managing devices and subsystems in this storage environment. Using this protocol, this e ISO/IEC 24775-4:2021 describes the information available to a WBEM Client from an SMI-S compliant WBEM Server.
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INTERNATIONAL ISO/IEC
STANDARD 24775-4
Second edition
2021-03
Information technology — Storage
management —
Part 4:
Block devices
Reference number
ISO/IEC 24775-4:2021(E)
©
ISO/IEC 2021
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ISO/IEC 24775-4:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
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ISO/IEC 24775-4:2021(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of document should be noted (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details
of any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC list of patent
declarations received (see http://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),
see www.iso.org/iso/foreword.html.
This document was prepared by SNIA (as Storage Management Technical Specification, Part 4 Block
Devices, Version 1.8.0, Revision 5) and drafted in accordance with its editorial rules. It was adopted,
under the JTC 1 PAS procedure, by Joint Technical Committee ISO/IEC JTC 1, Information technology.
This second edition cancels and replaces the first edition (ISO/IEC 24775-4:2014), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— USAGE text was revised to address code (now included in the front matter for all SNIA specifications)
— All recipes and their references were deleted.
— Instances of subprofile were changed to profile. In the annex, instances of subprofile were changed
to component profile (TSG meeting voice vote).
— Profile versions and related text were updated. (TSG meeting voice vote).
— Indications have been replaced by DMTF Indications, and all affected clauses updated. (TSG meeting
voice vote).
— Instances of Experimental within profiles already labeled as Experimental were removed to avoid
confusion and redundancy. (Editorial change)
— CIM/XML was changed to CIM-XML (Response to ballot comments).
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ISO/IEC 24775-4:2021(E)
— Annex: SMI-S Information Model.
— The CIM schema version was changed to 2.51 for V1.8.0 Rev3.
— TSG-SMIS-SCR00315.001
— Promoted the maturity level from DRAFT to EXPERIMENTAL for these revisions that update
profiles to remove SNIA_ classes and use DMTF CIM_ classes in these profiles: Array, Block
Services Package, Block Storage Views, CKD Block Services, Disk Drive Lite, Sparing, Erasure,
Extent Composition, Masking and Mapping, Storage Server Asymmetry, Storage Virtualizer,
Storage Element Protection, Replication Services, Pools from Volumes, Group Masking and
Mapping, Storage Relocation, Thin Provisioning. Registry of Storage Extent Discriminators.
— TSG-SMIS-SCR00316.001
— Promoted the changes from Draft to Experimental in SMI-S 1.7.0 for these revisions: Add
additional alerts for CIM/ block and file classes in these profiles: Array, Block Services Package,
Replication Services.
— XML was changed to CIM-XML (Response to ballot comments)
— Array Profile (SMIS-170-Draft-SCR00004)
— Added additional Mandatory Indication Filters to track modification of OperationalStatus and
ElementName for the top-level CS.
— Fixes required for SCR00316 to resolve duplicate use of standard messagesArray Profile.
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Fixed the version reference in the CIM Elements table for CIM_ComputerSystem (Top Level
System) to match the version defined by the Array Profile.
— Changed the Requirement for CIM_SystemDevice (System to SCSIProtocolController) to
Conditional (from Mandatory), since the SCSIProtocolController is Conditional.
— Made the Requirement for OtherIdentifyingInfo and IdentifyingDescriptions in
CIM_ComputerSystem (Top Level System) Mandatory to maintain backward compatibility with
1.6.1.
— Automated Storage Tiering Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Changed “DeleteOnEmptyElement” to “DeleteOnEmptyStorageTier” in CIM_StorageTier and
CIM_TierSettingData to match the mof.
— Automated Storage Tiering Policy Profile
— Propagated the Automated Storage Tiering changes to the Automated Storage Tiering Policy
Profile.
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Block Server Performance Profile (SMIS-170-Draft-SCR00001.001):
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ISO/IEC 24775-4:2021(E)
— Added support for Advanced Metrics.
— Updated and promoted the SNIA classes to CIM Classes.
— Made a minor adjustment to discovery of Rated Data.
— Marked the rated data properties experimental.
— Cleaned up references to Volume Management, which has been deprecated.
— In Summary of Statistics Support by Element table, revised legend for ReadIOTimeCounter and
WriteIOTimeCounter for Top Level Computer System to be Optional (comments to SCR#
SMIS-170-Draft-SCR00001).
— Promoted Draft material to Experimental (SMIS-170-EXPERIMENTAL-SCR00001).
— Corrected QueryStatisticalCollection to QueryStatisticsCollection.
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Promoted “Advanced Metrics” from Draft to Experimental.
— Added the GetRateStatisticsCollection() method to the CIM Elements table for
CIM_BlockStatisticsService as defined in the text of the profile.
— Block Services Package
— Added a new condition for keeping OperationalStatus on storage pools (SMIS-170-Draft-
SCR00003).
— Added additional Mandatory Indication Filters for Storage Pools, Storage Volumes and Logical
Disks to track size and name changes (SMIS-170-Draft-SCR00004).
— Added Alert indications from TP (SMIS-170-Draft-SCR00004).
— Removed Experimental qualifier and dependency on Experimental Indications (SMIS-170-
Draft- SCR00004).
— AlertIndication DRM30 was marked as Mandatory (SMIS-170-Draft-SCR00004).
— Removed RECIPE entry for unused recipe SMI_BlockServices_ExpandStorageElement
(SMIS-150- Errata-SCR00061).
— Promoted to experimental a new condition for keeping OperationalStatus on storage pools
and updated the health section to reflect new OperationalStatus encodings (SMIS-170-Draft-
SCR00003).
— Promoted several sections to Stable (DRM-SMIS-SCR00254).
— Added footnote to Table 15.
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Added Storage Pool Diagnostics in the Related Profiles table.
— Changed the property AvailableFormFactor to AvailableFormFactorType in
CIM_StorageCapabilities to match the mof.
— Deleted the AvailablePortType property from CIM_StorageCapabilities since it is not in the
mof (it was replaced by AvailableInterconnectType).
— Added SupportedCompressionElements property to CIM_StorageCapabilities (completes
TEMP00001.001).
— Changed the property FormFactor to FormFactorType in CIM_StorageSetting to match the mof.
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ISO/IEC 24775-4:2021(E)
— In CIM_StorageConfigurationCapabilities (Concrete) the enumeration values were extended for
SupportedSynchronousActions. SupportedAsynchronousActions and
SupportedStorageElementFeatures to match the text of the profile (and the mof).
— In CIM_StorageConfigurationCapabilities (Global and Primordial) the enumeration values were
extended for SupportedStorageElementFeatures to match the text of the profile (and the mof).
— Added the CreateOrModifyAnyElementFromStoragePool() method to
CIM_StorageConfigurationService to match the text of the profile.
— Added CompressionActive, CompressionPercent, CompressionRate, CompressionState,
DedupActive and DedupPercent to the CIM Element tables for CIM_StoragePool (all variations).
— Promoted DedupActive and DedupPercent from Draft to Experimental in CIM_StoragePool (all
variations).
— Changed the Central Class from StorageConfigurationService to CIM_StoragePool (Primordial)
(TSGSMIS-SCR00333).
— Changed the property EncryptionSupported to Encryption in CIM_StorageCapabilities (SMIS-
180-Errata-SCR00001).
— Removed the property SupportedCompressionElements from CIM_StorageCapabilities
(SMIS-180-Errata-SCR00001).
— Block Services Resource Ownership Profile
— Added reference to SMI-S Version 1.4 Revision 6.
— Block Services with Thin Provisioning (SMIS-170-Draft-SCR00004)
— Added mandatory indications
— Block Storage Views Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Changed the Related Profile reference to Copy Services to be Replication Services, since Copy
Services was deprecated in favor of Replication Services.
— Deleted an extra DDLocationIndicator entry from the CIM_DiskDriveView CIM Elements table.
— CKD Block Services Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Propagated the Block Services Package changes to the CKD Block Services Profile.
— Changed the Central Class from StoragePool to CIM_StoragePool (Primordial) (TSG-SMIS-
SCR00333).
— Changed the property EncryptionSupported to Encryption in CIM_StorageCapabilities
(SMIS-180-Errata-SCR00001).
— Removed the property SupportedCompressionElements from CIM_StorageCapabilities
(SMIS-180-Errata-SCR00001).
— Copy Services Profile
— Marked as Deperecated (DRM-SMIS-SCR-00253.001).
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ISO/IEC 24775-4:2021(E)
— Disk Drive Profile
— Removed this obsolete and already deprecated clause (DRM-SMIS-SCR00254).
— Disk Drive Lite (SMIS-170-Draft-SCR00004)
— Added additional Mandatory Indication Filter to track modification of OperationalStatus.
— Disk Drive Lite Profile
— Changed the references to “Disk Drive Light” to “Disk Drive Lite” in the Synopsis.
— Added DiskType, FormFactor and Encryption properties to the CIM_DiskDrive CIM Elements
table to match the text of the profile.
— Disk Sparing Profile
— Removed the Draft “ExtentDiscriminator” property from CIM_LogicalDisk, CIM_StorageVolume
and
CIM_StorageExtent.
— Changed the Central Class from ComputerSystem to CIM_StorageRedundancySet (TSG-
SMISSCR00333).
— Erasure Profile
— Added conditional requirements for the conditions for implementing CIM_LogicalDisk and
CIM_StorageVolume.
— Changed ErasureSetting to StorageErasureSetting, ErasureService to StorageErasureService
ErasureCapabilities to StorageErasureCapabilities.
— Extent Composition Profile
— Changed the version of the profile to be 1.7.0 due to indication classes removed in 1.7.0.
—. Added footnotes to Table 292.
— Extent Mapping Profile
— Removed this obsolete and already deprecated clause (DRM-SMIS-SCR00254)
— Group Masking and Mapping Profile
— Propagated the Masking and Mapping changes to the Group Masking and Mapping Profile.
— Added MoveMembers and CreateOrModifyMaskingGroup to the CIM Element table for
CIM_GroupMaskingMappingService.
— Removed the property GetMaskingGroupOperationOrder and the method
GetSupportedGroupMaximums from the CIM Elements table for
CIM_GroupMaskingMappingCapabilities, since they are not in the mof and not referenced
anywhere in the profile text.
— Made Alert Indication mandatory (SMIS-170-Draft-SCR00004).
— Promoted to Stable (DRM-SMIS-SCR00254.000).
— LUN Creation Profile
— Removed this obsolete and already deprecated clause (DRM-SMIS-SCR00254).
— LUN Mapping and Masking Profile
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ISO/IEC 24775-4:2021(E)
— Removed this obsolete and already deprecated clause (DRM-SMIS-SCR00254).
— Masking and Mapping Profile
— Added CIM_SystemDevice between the ProtocolController and its scoping system.
— Added SupportedAsynchronousActions and SupportedSynchronousActions to the CIM
Elements table for CIM_ProtocolControllerMaskingCapabilities.
— Changed the version of the profile to be 1.8.0 due the aforementioned changes.
— Added additional Mandatory Indication Filter to track modification of masking objects
StorageHardwareID, SAPAvailableForElement (SMIS-170-Draft-SCR00004).
— Added alert if the Masking View changes(SMIS-170-Draft-SCR00004).
— Added element and element desciprtion: 14.6.1 CIM_AssociatedPrivilege (TSG meeting voice
vote).
— Pools from Volumes Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Pool Manipulation Capabilities, and Settings Profile
— Removed this obsolete and already deprecated clause (DRM-SMIS-SCR00254).
— Replication Services Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Removed the Condition for semi-fixed filter support, since the class has been deleted from the
spec and made adjustments to the conditions defined on it.
— Changed the method name GetReplicationRelationshipInstance to
GetReplicationRelationshipInstances in the CIM Elements table for CIM_ReplicationService.
— Made CIM_AllocatedResources and its CIM_HostedCollection Conditional on the "Remote"
condition.
— In CIM_SAPAvailableForFileShare changed the "FileShare" reference to be "ManagedElement"
to match the mof.
— In CIM_SettingsAffectSettings changed the " ManagedElement " reference to be "Dependent"
and
changed the "SettingData" reference to be "Antecedent" to match the mof.
— Promoted to Implemented (DRM-SMIS-SCR00253).
— Made InstDeletion of StorageSynchronized mandatory(SMIS-170-Draft-SCR00004).
— Storage Element Protection Profile
— Changed all references to CIM_ElementProtectionSettingData to
CIM_ElementStorageProtectionSettingData.
— Added Keys to StorageProtectionCapabilities, StorageProtectionService and
StorageProtectionSettings.
— Changed the version of the profile to be 1.8.0 due to the aforementioned changes
— Storage Pool Diagnostics Profile
— Edited the profile to remove experimental indication classes and filter collections.
— Added propagation information for the specialization of the DMTF Diagnostics Profile.
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ISO/IEC 24775-4:2021(E)
— Changed the references in CIM_ElementDiagnostics to be Antecedent and Dependent to match
the mof.
— Changed the property name of TestType to TestTypes in CIM_StoragePoolDiagnosticTest to
match the mof.
— Changed the property name of OtherStoragePoolTestTypeDescription to
OtherStoragePoolTestType in CIM_StoragePoolDiagnosticTest to match the mof.
— Fixed the information on CIM_ServiceAffectsElement to replace reference to port controllers to
storage pools.
— Changed the version to 1.8.0 because it will rely on CIM 2.51.
— Added a new profile to cover diagnostic tests on storage pools (SMIS-170-Draft-SCR00003).
— Promoted to experimental the new profile to cover diagnostic tests on storage pools
(SMIS-170-DraftSCR00003.002).
— Table 671: corrected Version column for Diagnostic Job Control to be 1.0.0b.
— Table 683: Changed DIAG2 to DIAG0.
— Storage Relocation Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Storage Server Asymmetry Profile
— Added a class table for CIM_StorageResourceLoadGroup.
— Added keys to the class tables for CIM_StorageServerAsymmetryCapabilities and
CIM_TargetPortGroup.
— Added a related profile for the Multiple Computer System profile (TSG-SMIS-SCR00332).
— Changed Central Class to CIM_StorageServerAsymmetryCapabilities since it is defined in the
profile.
(TSG-SMIS-SCR00332).
— Storage Virtualizer Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Changed the related profile group for initiators to be optional (to be consistent with 1.6.1).
— Clarified the possible values for Dedicated in the Top Level System and Shadow systems.
— Changed the version of the profile to be 1.8.0 (since a mof was added to 2.51 to support the
profile).
— Removed reference to Cascaing Profile, which has been removed.
— Revised Figure 96: Storage Virtualizer System Instance to remove ProtocolControllerForPort
and
reference to SPC (TSG meeting voice vote).
— Thin Provisioning Profile
— Propagated the Block Services Package changes to the Thin Provisioning Profile.
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Added Storage Pool Diagnostics to the Supported Profile List.
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ISO/IEC 24775-4:2021(E)
— Changed the Central Class from StorageConfigurationService to CIM_StoragePool (Primordial)
(TSGSMIS-SCR00333).
— Changed the property EncryptionSupported to Encryption in CIM_StorageCapabilities (SMIS-
180-
Errata-SCR00001).
— Removed the property SupportedCompressionElements from CIM_StorageCapabilities (SMIS-
180-
Errata-SCR00001).
— Promoted to Stable (DRM-SMIS-SCR00254).
— AlertIndication DRM30 was marked as Mandatory (SMIS-170-Draft-SCR00004).
— Volume Composition Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Extended the enumeration values for SupportedStorageElements in
CIM_StorageElementCompositionCapabilities.
— Changed GetSupportedCompositeStripeDepths and
GetSupportedCompositeStripeDepthRange to GetSupportedStripeDepths and
GetSupportedStripeDepthRange to match the mof.
— Addded GetSupportedStripeLengths and GetSupportedStripeLengthRange to
CIM_StorageElementCompositionService.
— Added CreateOrModifyCompositeElementFromStoragePool to
CIM_StorageElementCompositionService.
— Changed the version of the profile to be 1.8.0 due to the aforementioned changes.
— Changed the Central Class from StorageVolume to CIM_StorageElementCompositionService
(TSGSMIS-SCR00333).
— Volume Management Profile
— Added reference to SMI-S Version 1.6.1 in deprecated Volume Management Profile.
— Annex A (informative) SMI-S Information Mode
— Removed statement about SNIA_ classes.
— References
— Updated and added references.
— Added DMTF v1.2.2, Indications Profile (and changed references to V1.2.2 throughout book).
— Removed irrelevant references: DSP0207, DSP0207.
— Added reference to DMTF DSP1102 Launch in Context Profile 1.0.0.
A list of all parts in the ISO/IEC 24775 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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ISO/IEC 24775-4:2021(E)
1 INTENDED AUDIENCE
2 This document is intended for use by individuals and companies engaged in developing, deploying, and
3 promoting interoperable multi-vendor SANs through the Storage Networking Industry Association (SNIA)
4 organization.
5 CHANGES TO THE SPECIFICATION
6 Each publication of this specification is uniquely identified by a three-level identifier, comprised of a
7 version number, a release number and an update number. The current identifier for this specification is
8 version 1.8.0. Future publications of this specification are subject to specific constraints on the scope of
9 change that is permissible from one publication to the next and the degree of interoperability and
10 backward compatibility that should be assumed between products designed to different publications of
this standard. The SNIA has defined three levels of change to a specification:
11
• Major Revision: A major revision of the specification represents a substantial change to the underlying scope
12
or architecture of the SMI-S API. A major revision results in an increase in the version number of the version
13
identifier (e.g., from version 1.x.x to version 2.x.x). There is no assurance of interoperability or backward
compatibility between releases with different version numbers.
14
15
• Minor Revision: A minor revision of the specification represents a technical change to existing content or an
16
adjustment to the scope of the SMI-S API. A minor revision results in an increase in the release number of
17
the specification’s identifier (e.g., from x.1.x to x.2.x). Minor revisions with the same version number preserve
interoperability and backward compatibility.
18
• Update: An update to the specification is limited to minor corrections or clarifications of existing specification
19
content. An update will result in an increase in the third component of the release identifier (e.g., from x.x.1 to
20
x.x.2). Updates with the same version and minor release levels preserve interoperability and backward
21
compatibility.
22
23
TYPOGRAPHICAL CONVENTIONS
24
Maturity Level
25
In addition to informative and normative content, this specification includes guidance about the maturity
26
of emerging material that has completed a rigorous design review but has limited implementation in
27
commercial products. This material is clearly delineated as described in the following sections. The
28
typographical convention is intended to provide a sense of the maturity of the affected material, without
29 altering its normative content. By recognizing the relative maturity of different sections of the standard, an
30 implementer should be able to make more informed decisions about the adoption and deployment of
31 different portions of the standard in a commercial product.
32
This specification has been structured to convey both the formal requirements and assumptions of the
33 SMI-S API and its emerging implementation and deployment lifecycle. Over time, the intent is that all
34 content in the specification will represent a mature and stable design, be verified by extensive
35 implementation experience, assure consistent support for backward compatibility, and rely solely on
36 content material that has reached a similar level of maturity. Unless explicitly labeled with one of the
subordinate maturity levels defined for this specification, content is assumed to satisfy these
37 requirements and is referred to as “Finalized”. Since much of the evolving specification
38 content in any given release will not have matured to that level, this specification defines three
subordinate levels of implementation maturity that identify important aspects of the content’s increasing
39
maturity and stability. Each subordinate maturity level is defined by its level of implementation
40
experience, its stability and its reliance on other emerging standards. Each subordinate maturity level is
41
identified by a unique typographical tagging convention that clearly distinguishes content at one maturity
42
model from content at another level.
43
44
45
11
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ISO/IEC 24775-4:2021(E)
46 Experimental Maturity Level
47
No material is included in this document unless its initial architecture has been completed and reviewed.
48
Some content included in this document has complete and reviewed design, but lacks implementation
49
experience and the maturity gained through implementation experience. This content is included in order
50
to gain wider review and to gain implementation experience. This material is referred to as
51
“Experimental”. It is presented here as an aid to implementers who are interested in likely future
52
developments within the SMI specification. The contents of an Experimental profile may change as
implementation experience is gained. There is a high likelihood that the changed content will be included
53
in an upcoming revision of the specification. Experimental material can advance to a higher maturity level
54
as soon as implementations are available. Figure 1 is a sample of the typographical convention for
55
Experimental content.
56
57
58
EXPERIMENTAL
59
Experimental content appears here.
60
61
EXPERIMENTAL
62
63
64
Figure 1 - Experimental Maturity Level Tag
65
66
67
Implemented Maturity Level
68
Profiles for which initial implementations have been completed are classified as “Implemented”. This
69
indicates that at least two different vendors have implemented the profile, including at least one provider
implementation. At this maturity level, the underlying architecture and modeling are stable, and changes
in future revisions will be limited to the correction of deficiencies identified through additional
implementation experience. Should the material become obsolete in the future, it must be deprecated in a
minor revision of the specification prior to its removal from subsequent releases. Figure 2 is a sample of
the typographical convention for Implemented content.
IMPLEMENTED
Implemented content appears here.
70
IMPLEMENTED
71
72
Figure 2 - Implemented Maturity Level Tag
73
74
75
Stable Maturity Level
Once content at the Implemented maturity level has garnered additional implementation experience, it
can be tagged at the Stable maturity level. Material at this maturity level has been implemented by three
different vendors, including both a provider and a client. Should material that has reached this maturity
level become obsolete, it may only be deprecated as part of a minor revision to the specification. Material
at this maturity level that has been deprecated may only be removed from the specification as part of a
major revision. A profile that has reached this maturity level is guaranteed to preserve backward
compatibility from one minor specification revision to the next. As a result, Profiles at or above the Stable
12
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ISO/IEC 24775-4:2021(E)
76 maturity level shall not rely on any content that is Experimental. Figure 3 is a sample of the typographical
77 convention for Implemented content.
STABLE
Stable content appears here.
STABLE
Figure 3 - Stable Maturity Level Tag
78 Finalized Maturity Level
79 Content that has reached the highest maturity level is referred to as “Finalized.” In addition to satisfying
80 the requirements for the Stable maturity level, content at the Finalized maturity level must solely depend
81 upon or refine material that has also reached the Finalized level. If specification content depends upon
82 material that is not under the control of the SNIA, and therefore not subject to its maturity level
83 definitions, then the external content is evaluated by the SNIA to assure that it has achieved a
84 comparable level of completion, stability, and implementation experience. Should material that has
85 reached this maturity level become obsolete, it may only be deprecated as part of a major revision to the
86 specification. A profile that has reached this maturity level is guaranteed to preserve backward
87 compatibility from one minor specification revision to the next. Over time, it is hoped that all specification
content will attain this maturity level. Accordingly, there is no special typographical convention, as there is
with the other, subordinate maturity levels. Unless content in the specification is marked with one of the
typographical conventions defined for the subordinate maturity levels, it should be assumed to have
reached the Finalized maturity level.
Deprecated Material
Non-Experimental material can be depreca
...
INTERNATIONAL ISO/IEC
STANDARD 24775-4
Second edition
2021-03
Information technology — Storage
management —
Part 4:
Block devices
Reference number
ISO/IEC 24775-4:2021(E)
©
ISO/IEC 2021
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ISO/IEC 24775-4:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2021 – All rights reserved
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ISO/IEC 24775-4:2021(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of document should be noted (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details
of any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC list of patent
declarations received (see http://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),
see www.iso.org/iso/foreword.html.
This document was prepared by SNIA (as Storage Management Technical Specification, Part 4 Block
Devices, Version 1.8.0, Revision 5) and drafted in accordance with its editorial rules. It was adopted,
under the JTC 1 PAS procedure, by Joint Technical Committee ISO/IEC JTC 1, Information technology.
This second edition cancels and replaces the first edition (ISO/IEC 24775-4:2014), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— USAGE text was revised to address code (now included in the front matter for all SNIA specifications)
— All recipes and their references were deleted.
— Instances of subprofile were changed to profile. In the annex, instances of subprofile were changed
to component profile (TSG meeting voice vote).
— Profile versions and related text were updated. (TSG meeting voice vote).
— Indications have been replaced by DMTF Indications, and all affected clauses updated. (TSG meeting
voice vote).
— Instances of Experimental within profiles already labeled as Experimental were removed to avoid
confusion and redundancy. (Editorial change)
— CIM/XML was changed to CIM-XML (Response to ballot comments).
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ISO/IEC 24775-4:2021(E)
— Annex: SMI-S Information Model.
— The CIM schema version was changed to 2.51 for V1.8.0 Rev3.
— TSG-SMIS-SCR00315.001
— Promoted the maturity level from DRAFT to EXPERIMENTAL for these revisions that update
profiles to remove SNIA_ classes and use DMTF CIM_ classes in these profiles: Array, Block
Services Package, Block Storage Views, CKD Block Services, Disk Drive Lite, Sparing, Erasure,
Extent Composition, Masking and Mapping, Storage Server Asymmetry, Storage Virtualizer,
Storage Element Protection, Replication Services, Pools from Volumes, Group Masking and
Mapping, Storage Relocation, Thin Provisioning. Registry of Storage Extent Discriminators.
— TSG-SMIS-SCR00316.001
— Promoted the changes from Draft to Experimental in SMI-S 1.7.0 for these revisions: Add
additional alerts for CIM/ block and file classes in these profiles: Array, Block Services Package,
Replication Services.
— XML was changed to CIM-XML (Response to ballot comments)
— Array Profile (SMIS-170-Draft-SCR00004)
— Added additional Mandatory Indication Filters to track modification of OperationalStatus and
ElementName for the top-level CS.
— Fixes required for SCR00316 to resolve duplicate use of standard messagesArray Profile.
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Fixed the version reference in the CIM Elements table for CIM_ComputerSystem (Top Level
System) to match the version defined by the Array Profile.
— Changed the Requirement for CIM_SystemDevice (System to SCSIProtocolController) to
Conditional (from Mandatory), since the SCSIProtocolController is Conditional.
— Made the Requirement for OtherIdentifyingInfo and IdentifyingDescriptions in
CIM_ComputerSystem (Top Level System) Mandatory to maintain backward compatibility with
1.6.1.
— Automated Storage Tiering Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Changed “DeleteOnEmptyElement” to “DeleteOnEmptyStorageTier” in CIM_StorageTier and
CIM_TierSettingData to match the mof.
— Automated Storage Tiering Policy Profile
— Propagated the Automated Storage Tiering changes to the Automated Storage Tiering Policy
Profile.
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Block Server Performance Profile (SMIS-170-Draft-SCR00001.001):
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ISO/IEC 24775-4:2021(E)
— Added support for Advanced Metrics.
— Updated and promoted the SNIA classes to CIM Classes.
— Made a minor adjustment to discovery of Rated Data.
— Marked the rated data properties experimental.
— Cleaned up references to Volume Management, which has been deprecated.
— In Summary of Statistics Support by Element table, revised legend for ReadIOTimeCounter and
WriteIOTimeCounter for Top Level Computer System to be Optional (comments to SCR#
SMIS-170-Draft-SCR00001).
— Promoted Draft material to Experimental (SMIS-170-EXPERIMENTAL-SCR00001).
— Corrected QueryStatisticalCollection to QueryStatisticsCollection.
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Promoted “Advanced Metrics” from Draft to Experimental.
— Added the GetRateStatisticsCollection() method to the CIM Elements table for
CIM_BlockStatisticsService as defined in the text of the profile.
— Block Services Package
— Added a new condition for keeping OperationalStatus on storage pools (SMIS-170-Draft-
SCR00003).
— Added additional Mandatory Indication Filters for Storage Pools, Storage Volumes and Logical
Disks to track size and name changes (SMIS-170-Draft-SCR00004).
— Added Alert indications from TP (SMIS-170-Draft-SCR00004).
— Removed Experimental qualifier and dependency on Experimental Indications (SMIS-170-
Draft- SCR00004).
— AlertIndication DRM30 was marked as Mandatory (SMIS-170-Draft-SCR00004).
— Removed RECIPE entry for unused recipe SMI_BlockServices_ExpandStorageElement
(SMIS-150- Errata-SCR00061).
— Promoted to experimental a new condition for keeping OperationalStatus on storage pools
and updated the health section to reflect new OperationalStatus encodings (SMIS-170-Draft-
SCR00003).
— Promoted several sections to Stable (DRM-SMIS-SCR00254).
— Added footnote to Table 15.
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Added Storage Pool Diagnostics in the Related Profiles table.
— Changed the property AvailableFormFactor to AvailableFormFactorType in
CIM_StorageCapabilities to match the mof.
— Deleted the AvailablePortType property from CIM_StorageCapabilities since it is not in the
mof (it was replaced by AvailableInterconnectType).
— Added SupportedCompressionElements property to CIM_StorageCapabilities (completes
TEMP00001.001).
— Changed the property FormFactor to FormFactorType in CIM_StorageSetting to match the mof.
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ISO/IEC 24775-4:2021(E)
— In CIM_StorageConfigurationCapabilities (Concrete) the enumeration values were extended for
SupportedSynchronousActions. SupportedAsynchronousActions and
SupportedStorageElementFeatures to match the text of the profile (and the mof).
— In CIM_StorageConfigurationCapabilities (Global and Primordial) the enumeration values were
extended for SupportedStorageElementFeatures to match the text of the profile (and the mof).
— Added the CreateOrModifyAnyElementFromStoragePool() method to
CIM_StorageConfigurationService to match the text of the profile.
— Added CompressionActive, CompressionPercent, CompressionRate, CompressionState,
DedupActive and DedupPercent to the CIM Element tables for CIM_StoragePool (all variations).
— Promoted DedupActive and DedupPercent from Draft to Experimental in CIM_StoragePool (all
variations).
— Changed the Central Class from StorageConfigurationService to CIM_StoragePool (Primordial)
(TSGSMIS-SCR00333).
— Changed the property EncryptionSupported to Encryption in CIM_StorageCapabilities (SMIS-
180-Errata-SCR00001).
— Removed the property SupportedCompressionElements from CIM_StorageCapabilities
(SMIS-180-Errata-SCR00001).
— Block Services Resource Ownership Profile
— Added reference to SMI-S Version 1.4 Revision 6.
— Block Services with Thin Provisioning (SMIS-170-Draft-SCR00004)
— Added mandatory indications
— Block Storage Views Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Changed the Related Profile reference to Copy Services to be Replication Services, since Copy
Services was deprecated in favor of Replication Services.
— Deleted an extra DDLocationIndicator entry from the CIM_DiskDriveView CIM Elements table.
— CKD Block Services Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Propagated the Block Services Package changes to the CKD Block Services Profile.
— Changed the Central Class from StoragePool to CIM_StoragePool (Primordial) (TSG-SMIS-
SCR00333).
— Changed the property EncryptionSupported to Encryption in CIM_StorageCapabilities
(SMIS-180-Errata-SCR00001).
— Removed the property SupportedCompressionElements from CIM_StorageCapabilities
(SMIS-180-Errata-SCR00001).
— Copy Services Profile
— Marked as Deperecated (DRM-SMIS-SCR-00253.001).
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ISO/IEC 24775-4:2021(E)
— Disk Drive Profile
— Removed this obsolete and already deprecated clause (DRM-SMIS-SCR00254).
— Disk Drive Lite (SMIS-170-Draft-SCR00004)
— Added additional Mandatory Indication Filter to track modification of OperationalStatus.
— Disk Drive Lite Profile
— Changed the references to “Disk Drive Light” to “Disk Drive Lite” in the Synopsis.
— Added DiskType, FormFactor and Encryption properties to the CIM_DiskDrive CIM Elements
table to match the text of the profile.
— Disk Sparing Profile
— Removed the Draft “ExtentDiscriminator” property from CIM_LogicalDisk, CIM_StorageVolume
and
CIM_StorageExtent.
— Changed the Central Class from ComputerSystem to CIM_StorageRedundancySet (TSG-
SMISSCR00333).
— Erasure Profile
— Added conditional requirements for the conditions for implementing CIM_LogicalDisk and
CIM_StorageVolume.
— Changed ErasureSetting to StorageErasureSetting, ErasureService to StorageErasureService
ErasureCapabilities to StorageErasureCapabilities.
— Extent Composition Profile
— Changed the version of the profile to be 1.7.0 due to indication classes removed in 1.7.0.
—. Added footnotes to Table 292.
— Extent Mapping Profile
— Removed this obsolete and already deprecated clause (DRM-SMIS-SCR00254)
— Group Masking and Mapping Profile
— Propagated the Masking and Mapping changes to the Group Masking and Mapping Profile.
— Added MoveMembers and CreateOrModifyMaskingGroup to the CIM Element table for
CIM_GroupMaskingMappingService.
— Removed the property GetMaskingGroupOperationOrder and the method
GetSupportedGroupMaximums from the CIM Elements table for
CIM_GroupMaskingMappingCapabilities, since they are not in the mof and not referenced
anywhere in the profile text.
— Made Alert Indication mandatory (SMIS-170-Draft-SCR00004).
— Promoted to Stable (DRM-SMIS-SCR00254.000).
— LUN Creation Profile
— Removed this obsolete and already deprecated clause (DRM-SMIS-SCR00254).
— LUN Mapping and Masking Profile
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ISO/IEC 24775-4:2021(E)
— Removed this obsolete and already deprecated clause (DRM-SMIS-SCR00254).
— Masking and Mapping Profile
— Added CIM_SystemDevice between the ProtocolController and its scoping system.
— Added SupportedAsynchronousActions and SupportedSynchronousActions to the CIM
Elements table for CIM_ProtocolControllerMaskingCapabilities.
— Changed the version of the profile to be 1.8.0 due the aforementioned changes.
— Added additional Mandatory Indication Filter to track modification of masking objects
StorageHardwareID, SAPAvailableForElement (SMIS-170-Draft-SCR00004).
— Added alert if the Masking View changes(SMIS-170-Draft-SCR00004).
— Added element and element desciprtion: 14.6.1 CIM_AssociatedPrivilege (TSG meeting voice
vote).
— Pools from Volumes Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Pool Manipulation Capabilities, and Settings Profile
— Removed this obsolete and already deprecated clause (DRM-SMIS-SCR00254).
— Replication Services Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Removed the Condition for semi-fixed filter support, since the class has been deleted from the
spec and made adjustments to the conditions defined on it.
— Changed the method name GetReplicationRelationshipInstance to
GetReplicationRelationshipInstances in the CIM Elements table for CIM_ReplicationService.
— Made CIM_AllocatedResources and its CIM_HostedCollection Conditional on the "Remote"
condition.
— In CIM_SAPAvailableForFileShare changed the "FileShare" reference to be "ManagedElement"
to match the mof.
— In CIM_SettingsAffectSettings changed the " ManagedElement " reference to be "Dependent"
and
changed the "SettingData" reference to be "Antecedent" to match the mof.
— Promoted to Implemented (DRM-SMIS-SCR00253).
— Made InstDeletion of StorageSynchronized mandatory(SMIS-170-Draft-SCR00004).
— Storage Element Protection Profile
— Changed all references to CIM_ElementProtectionSettingData to
CIM_ElementStorageProtectionSettingData.
— Added Keys to StorageProtectionCapabilities, StorageProtectionService and
StorageProtectionSettings.
— Changed the version of the profile to be 1.8.0 due to the aforementioned changes
— Storage Pool Diagnostics Profile
— Edited the profile to remove experimental indication classes and filter collections.
— Added propagation information for the specialization of the DMTF Diagnostics Profile.
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ISO/IEC 24775-4:2021(E)
— Changed the references in CIM_ElementDiagnostics to be Antecedent and Dependent to match
the mof.
— Changed the property name of TestType to TestTypes in CIM_StoragePoolDiagnosticTest to
match the mof.
— Changed the property name of OtherStoragePoolTestTypeDescription to
OtherStoragePoolTestType in CIM_StoragePoolDiagnosticTest to match the mof.
— Fixed the information on CIM_ServiceAffectsElement to replace reference to port controllers to
storage pools.
— Changed the version to 1.8.0 because it will rely on CIM 2.51.
— Added a new profile to cover diagnostic tests on storage pools (SMIS-170-Draft-SCR00003).
— Promoted to experimental the new profile to cover diagnostic tests on storage pools
(SMIS-170-DraftSCR00003.002).
— Table 671: corrected Version column for Diagnostic Job Control to be 1.0.0b.
— Table 683: Changed DIAG2 to DIAG0.
— Storage Relocation Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Storage Server Asymmetry Profile
— Added a class table for CIM_StorageResourceLoadGroup.
— Added keys to the class tables for CIM_StorageServerAsymmetryCapabilities and
CIM_TargetPortGroup.
— Added a related profile for the Multiple Computer System profile (TSG-SMIS-SCR00332).
— Changed Central Class to CIM_StorageServerAsymmetryCapabilities since it is defined in the
profile.
(TSG-SMIS-SCR00332).
— Storage Virtualizer Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Changed the related profile group for initiators to be optional (to be consistent with 1.6.1).
— Clarified the possible values for Dedicated in the Top Level System and Shadow systems.
— Changed the version of the profile to be 1.8.0 (since a mof was added to 2.51 to support the
profile).
— Removed reference to Cascaing Profile, which has been removed.
— Revised Figure 96: Storage Virtualizer System Instance to remove ProtocolControllerForPort
and
reference to SPC (TSG meeting voice vote).
— Thin Provisioning Profile
— Propagated the Block Services Package changes to the Thin Provisioning Profile.
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Added Storage Pool Diagnostics to the Supported Profile List.
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ISO/IEC 24775-4:2021(E)
— Changed the Central Class from StorageConfigurationService to CIM_StoragePool (Primordial)
(TSGSMIS-SCR00333).
— Changed the property EncryptionSupported to Encryption in CIM_StorageCapabilities (SMIS-
180-
Errata-SCR00001).
— Removed the property SupportedCompressionElements from CIM_StorageCapabilities (SMIS-
180-
Errata-SCR00001).
— Promoted to Stable (DRM-SMIS-SCR00254).
— AlertIndication DRM30 was marked as Mandatory (SMIS-170-Draft-SCR00004).
— Volume Composition Profile
— Fixed versions numbers in the Related Profiles table to match the version identified for the
related profiles.
— Extended the enumeration values for SupportedStorageElements in
CIM_StorageElementCompositionCapabilities.
— Changed GetSupportedCompositeStripeDepths and
GetSupportedCompositeStripeDepthRange to GetSupportedStripeDepths and
GetSupportedStripeDepthRange to match the mof.
— Addded GetSupportedStripeLengths and GetSupportedStripeLengthRange to
CIM_StorageElementCompositionService.
— Added CreateOrModifyCompositeElementFromStoragePool to
CIM_StorageElementCompositionService.
— Changed the version of the profile to be 1.8.0 due to the aforementioned changes.
— Changed the Central Class from StorageVolume to CIM_StorageElementCompositionService
(TSGSMIS-SCR00333).
— Volume Management Profile
— Added reference to SMI-S Version 1.6.1 in deprecated Volume Management Profile.
— Annex A (informative) SMI-S Information Mode
— Removed statement about SNIA_ classes.
— References
— Updated and added references.
— Added DMTF v1.2.2, Indications Profile (and changed references to V1.2.2 throughout book).
— Removed irrelevant references: DSP0207, DSP0207.
— Added reference to DMTF DSP1102 Launch in Context Profile 1.0.0.
A list of all parts in the ISO/IEC 24775 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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ISO/IEC 24775-4:2021(E)
1 INTENDED AUDIENCE
2 This document is intended for use by individuals and companies engaged in developing, deploying, and
3 promoting interoperable multi-vendor SANs through the Storage Networking Industry Association (SNIA)
4 organization.
5 CHANGES TO THE SPECIFICATION
6 Each publication of this specification is uniquely identified by a three-level identifier, comprised of a
7 version number, a release number and an update number. The current identifier for this specification is
8 version 1.8.0. Future publications of this specification are subject to specific constraints on the scope of
9 change that is permissible from one publication to the next and the degree of interoperability and
10 backward compatibility that should be assumed between products designed to different publications of
this standard. The SNIA has defined three levels of change to a specification:
11
• Major Revision: A major revision of the specification represents a substantial change to the underlying scope
12
or architecture of the SMI-S API. A major revision results in an increase in the version number of the version
13
identifier (e.g., from version 1.x.x to version 2.x.x). There is no assurance of interoperability or backward
compatibility between releases with different version numbers.
14
15
• Minor Revision: A minor revision of the specification represents a technical change to existing content or an
16
adjustment to the scope of the SMI-S API. A minor revision results in an increase in the release number of
17
the specification’s identifier (e.g., from x.1.x to x.2.x). Minor revisions with the same version number preserve
interoperability and backward compatibility.
18
• Update: An update to the specification is limited to minor corrections or clarifications of existing specification
19
content. An update will result in an increase in the third component of the release identifier (e.g., from x.x.1 to
20
x.x.2). Updates with the same version and minor release levels preserve interoperability and backward
21
compatibility.
22
23
TYPOGRAPHICAL CONVENTIONS
24
Maturity Level
25
In addition to informative and normative content, this specification includes guidance about the maturity
26
of emerging material that has completed a rigorous design review but has limited implementation in
27
commercial products. This material is clearly delineated as described in the following sections. The
28
typographical convention is intended to provide a sense of the maturity of the affected material, without
29 altering its normative content. By recognizing the relative maturity of different sections of the standard, an
30 implementer should be able to make more informed decisions about the adoption and deployment of
31 different portions of the standard in a commercial product.
32
This specification has been structured to convey both the formal requirements and assumptions of the
33 SMI-S API and its emerging implementation and deployment lifecycle. Over time, the intent is that all
34 content in the specification will represent a mature and stable design, be verified by extensive
35 implementation experience, assure consistent support for backward compatibility, and rely solely on
36 content material that has reached a similar level of maturity. Unless explicitly labeled with one of the
subordinate maturity levels defined for this specification, content is assumed to satisfy these
37 requirements and is referred to as “Finalized”. Since much of the evolving specification
38 content in any given release will not have matured to that level, this specification defines three
subordinate levels of implementation maturity that identify important aspects of the content’s increasing
39
maturity and stability. Each subordinate maturity level is defined by its level of implementation
40
experience, its stability and its reliance on other emerging standards. Each subordinate maturity level is
41
identified by a unique typographical tagging convention that clearly distinguishes content at one maturity
42
model from content at another level.
43
44
45
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ISO/IEC 24775-4:2021(E)
46 Experimental Maturity Level
47
No material is included in this document unless its initial architecture has been completed and reviewed.
48
Some content included in this document has complete and reviewed design, but lacks implementation
49
experience and the maturity gained through implementation experience. This content is included in order
50
to gain wider review and to gain implementation experience. This material is referred to as
51
“Experimental”. It is presented here as an aid to implementers who are interested in likely future
52
developments within the SMI specification. The contents of an Experimental profile may change as
implementation experience is gained. There is a high likelihood that the changed content will be included
53
in an upcoming revision of the specification. Experimental material can advance to a higher maturity level
54
as soon as implementations are available. Figure 1 is a sample of the typographical convention for
55
Experimental content.
56
57
58
EXPERIMENTAL
59
Experimental content appears here.
60
61
EXPERIMENTAL
62
63
64
Figure 1 - Experimental Maturity Level Tag
65
66
67
Implemented Maturity Level
68
Profiles for which initial implementations have been completed are classified as “Implemented”. This
69
indicates that at least two different vendors have implemented the profile, including at least one provider
implementation. At this maturity level, the underlying architecture and modeling are stable, and changes
in future revisions will be limited to the correction of deficiencies identified through additional
implementation experience. Should the material become obsolete in the future, it must be deprecated in a
minor revision of the specification prior to its removal from subsequent releases. Figure 2 is a sample of
the typographical convention for Implemented content.
IMPLEMENTED
Implemented content appears here.
70
IMPLEMENTED
71
72
Figure 2 - Implemented Maturity Level Tag
73
74
75
Stable Maturity Level
Once content at the Implemented maturity level has garnered additional implementation experience, it
can be tagged at the Stable maturity level. Material at this maturity level has been implemented by three
different vendors, including both a provider and a client. Should material that has reached this maturity
level become obsolete, it may only be deprecated as part of a minor revision to the specification. Material
at this maturity level that has been deprecated may only be removed from the specification as part of a
major revision. A profile that has reached this maturity level is guaranteed to preserve backward
compatibility from one minor specification revision to the next. As a result, Profiles at or above the Stable
12
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ISO/IEC 24775-4:2021(E)
76 maturity level shall not rely on any content that is Experimental. Figure 3 is a sample of the typographical
77 convention for Implemented content.
STABLE
Stable content appears here.
STABLE
Figure 3 - Stable Maturity Level Tag
78 Finalized Maturity Level
79 Content that has reached the highest maturity level is referred to as “Finalized.” In addition to satisfying
80 the requirements for the Stable maturity level, content at the Finalized maturity level must solely depend
81 upon or refine material that has also reached the Finalized level. If specification content depends upon
82 material that is not under the control of the SNIA, and therefore not subject to its maturity level
83 definitions, then the external content is evaluated by the SNIA to assure that it has achieved a
84 comparable level of completion, stability, and implementation experience. Should material that has
85 reached this maturity level become obsolete, it may only be deprecated as part of a major revision to the
86 specification. A profile that has reached this maturity level is guaranteed to preserve backward
87 compatibility from one minor specification revision to the next. Over time, it is hoped that all specification
content will attain this maturity level. Accordingly, there is no special typographical convention, as there is
with the other, subordinate maturity levels. Unless content in the specification is marked with one of the
typographical conventions defined for the subordinate maturity levels, it should be assumed to have
reached the Finalized maturity level.
Deprecated Material
Non-Experimental material can be deprecat
...
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