# Class CIM_StorageExtent
extends CIM_LogicalDevice

StorageExtent describes the capabilities and management of the various media that exist to store data and allow data retrieval. This superclass could be used to represent the various components of RAID (Hardware or Software) or as a raw logical extent on top of physical media.

### Table of Contents
Hierarchy
Direct Known Subclasses
Class Qualifiers
Class Properties
Class Methods

## Class Hierarchy

CIM_ManagedElement
|
+--CIM_ManagedSystemElement
|
+--CIM_LogicalElement
|
+--CIM_EnabledLogicalElement
|
+--CIM_LogicalDevice
|
+--CIM_StorageExtent

## Direct Known Subclasses

CIM_AggregatePExtent
CIM_AggregatePSExtent
CIM_CompositeExtent
CIM_DatabaseSegment
CIM_LogicalDisk
CIM_MediaPartition
CIM_Memory
CIM_OpaqueManagementData
CIM_PhysicalExtent
CIM_ProtectedSpaceExtent
CIM_Snapshot
CIM_StorageVolume

## Class Qualifiers

Name | Data Type | Value
--- | --- | ---
Description | string | StorageExtent describes the capabilities and management of the various media that exist to store data and allow data retrieval. This superclass could be used to represent the various components of RAID (Hardware or Software) or as a raw logical extent on top of physical media.
UMLPackagePath | string | CIM::Core::StorageExtent
Version | string | 2.29.0

## Class Properties

### Local Class Properties

Name | Data Type | Default Value | Qualifiers
--- | --- | --- | ---
Name | Data Type | Value
Access | uint16 |
Description | string | Access describes whether the media is readable (value=1), writeable (value=2), or both (value=3). "Unknown" (0) and "Write Once" (4) can also be defined.
ValueMap | string | 0, 1, 2, 3, 4
Values | string | Unknown, Readable, Writeable, Read/Write Supported, Write Once
BlockSize | uint64 |
Description | string | Size in bytes of the blocks which form this StorageExtent. If variable block size, then the maximum block size in bytes should be specified. If the block size is unknown or if a block concept is not valid (for example, for AggregateExtents, Memory or LogicalDisks), enter a 1.
MappingStrings | string | MIF.DMTF|Host Storage|001.4, MIB.IETF|HOST-RESOURCES-MIB.hrStorageAllocationUnits, MIF.DMTF|Storage Devices|001.5
Units | string | Bytes
ConsumableBlocks | uint64 |

Description

string

The maximum number of blocks, of size BlockSize, which are available for consumption when layering StorageExtents using the BasedOn association. This property only has meaning when this StorageExtent is an Antecedent reference in a BasedOn relationship. For example, a StorageExtent could be composed of 120 blocks. However, the Extent itself may use 20 blocks for redundancy data. If another StorageExtent is BasedOn this Extent, only 100 blocks would be available to it. This information ('100 blocks is available for consumption') is indicated in the ConsumableBlocks property.

DataOrganization | uint16 |
Description | string | Type of data organization used.
ValueMap | string | 0, 1, 2, 3, 4
Values | string | Other, Unknown, Fixed Block, Variable Block, Count Key Data
DataRedundancy | uint16 |
Description | string | Number of complete copies of data currently maintained.
ModelCorrespondence | string | CIM_StorageSetting.DataRedundancyGoal, CIM_StorageSetting.DataRedundancyMax, CIM_StorageSetting.DataRedundancyMin
DeltaReservation | uint8 |
Description | string | Current value for Delta reservation. This is a percentage that specifies the amount of space that should be reserved in a replica for caching changes.
MaxValue | sint64 | 100
MinValue | sint64 | 1
ModelCorrespondence | string | CIM_StorageSetting.DeltaReservationGoal, CIM_StorageSetting.DeltaReservationMax, CIM_StorageSetting.DeltaReservationMin
Units | string | Percentage
ErrorMethodology | string |
Description | string | ErrorMethodology is a free-form string describing the type of error detection and correction supported by this StorageExtent.
IsBasedOnUnderlyingRedundancy | boolean |
Description | string | True indicates that the underlying StorageExtent(s) participate in a StorageRedundancyGroup.
Name | string |
Description | string | A unique identifier for the Extent.
MappingStrings | string | SPC.INCITS-T10| VPD 83, Association 0 | Identifier
MaxLen | uint32 | 1024
ModelCorrespondence | string | CIM_StorageExtent.NameFormat, CIM_StorageExtent.NameNamespace
Override | string | Name
NameFormat | uint16 |

Description

string

The list here applies to all StorageExtent subclasses. Please look at the Description in each subclass for guidelines on the approriate values for that subclass. Note that any of these formats could apply to a CompositeExtent. Note - this property originally touched on two concepts that are now separated into this property and NameNamespace. Values 2,3,4,5,6, and 8 are retained for backwards compatibility but are deprecated in lieu of the corresponding values in CIM_StorageExtent.NameNamespace. For example, the preferred source for SCSI virtual (RAID) disk names is from Inquiry VPD page 83 response, type 3 identifiers. These will have NameFormat set to 'NAA' and NameNamespace to 'VPD83Type3'. Format of the Name property. Values for extents representing SCSI volumes are (per SCSI SPC-3): 2 = VPD Page 83, NAA IEEE Registered Extended (VPD83NAA6) (DEPRECATED) 3 = VPD Page 83, NAA IEEE Registered (VPD83NAA5) (DEPRECATED) 4 = VPD Page 83, (VPD83Type2) (DEPRECATED) 5 = VPD Page 83, T10 Vendor Identification (VPD83Type1) (DEPRECATED) 6 = VPD Page 83, Vendor Specific (VPD83Type0) (DEPRECATED) 7 = Serial Number/Vendor/Model (SNVM) SNVM is 3 strings representing the vendor name, product name within the vendor namespace, and the serial number within the model namespace. Strings are delimited with a '+'. Spaces may be included and are significant. The serial number is the text representation of the serial number in hexadecimal upper case. This represents the vendor and model ID from SCSI Inquiry data; the vendor field MUST be 8 characters wide and the product field MUST be 16 characters wide. For example, 'ACME____+SUPER DISK______+124437458' (_ is a space character) 8 = Node WWN (for single LUN/controller) (NodeWWN) (DEPRECATED) 9 = NAA as a generic format. See http://standards.ieee.org/regauth/oui/tutorials/fibrecomp_id.html. Formatted as 16 or 32 unseparated uppercase hex characters (2 per binary byte). For example '21000020372D3C73' 10 = EUI as a generic format (EUI64) See http://standards.ieee.org/regauth/oui/tutorials/EUI64.html. Formatted as 16 unseparated uppercase hex characters (2 per binary byte) 11 = T10 vendor identifier format as returned by SCSI Inquiry VPD page 83, identifier type 1. See T10 SPC-3 specification. This is the 8-byte ASCII vendor ID from the T10 registry followed by a vendor specific ASCII identifier; spaces are permitted. For non SCSI volumes, 'SNVM' may be the most appropriate choice. 12 = OS Device Name (for LogicalDisks). See LogicalDisk Name description for details.

ModelCorrespondence | string | CIM_StorageExtent.Name, CIM_StorageExtent.NameNamespace, CIM_StorageExtent.OtherNameFormat
ValueMap | string | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
Values | string | Unknown, Other, VPD83NAA6, VPD83NAA5, VPD83Type2, VPD83Type1, VPD83Type0, SNVM, NodeWWN, NAA, EUI64, T10VID, OS Device Name
NameNamespace | uint16 |

Description

string

The preferred source SCSI for volume names is SCSI VPD Page 83 responses. Page 83 returns a list of identifiers for various device elements. The metadata for each identifier includes an Association field, identifiers with association of 0 apply to volumes. Page 83 supports several namespaces specified in the Type field in the identifier metadata. See SCSI SPC-3 specification. 2 = VPD Page 83, Type 3 NAA (NameFormat SHOULD be NAA) 3 = VPD Page 83, Type 2 EUI64 (NameFormat EUI) 4 = VPD Page 83, Type 1 T10 Vendor Identification (NameFormat T10) Less preferred volume namespaces from other interfaces: 5 = VPD page 80, Serial number (NameFormat SHOULD be Other) 6 = FC NodeWWN (NameFormat SHOULD be NAA or EUI) 7 = Serial Number/Vendor/Model (NameFormat SHOULD be SNVM) The preferred namespace for LogigicalDisk names is platform specific device namespace; see LogigicalDIsk Description. 8 = OS Device Namespace.

MappingStrings | string | SPC.INCITS-T10| VPD 83, Association 0 | Identifier
ModelCorrespondence | string | CIM_StorageExtent.Name, CIM_StorageExtent.OtherNameNamespace, CIM_StorageExtent.NameFormat
ValueMap | string | 0, 1, 2, 3, 4, 5, 6, 7, 8
Values | string | Unknown, Other, VPD83Type3, VPD83Type2, VPD83Type1, VPD80, NodeWWN, SNVM, OS Device Namespace
NoSinglePointOfFailure | boolean |
Description | string | Indicates whether or not there exists no single point of failure.
ModelCorrespondence | string | CIM_StorageSetting.NoSinglePointOfFailure
NumberOfBlocks | uint64 |
Description | string | Total number of logically contiguous blocks, of size Block Size, which form this Extent. The total size of the Extent can be calculated by multiplying BlockSize by NumberOfBlocks. If the BlockSize is 1, this property is the total size of the Extent.
MappingStrings | string | MIF.DMTF|Host Storage|001.5, MIB.IETF|HOST-RESOURCES-MIB.hrStorageSize
OtherNameFormat | string |
Description | string | A string describing the format of the Name property when NameFormat includes the value 1, "Other".
ModelCorrespondence | string | CIM_StorageExtent.NameFormat
OtherNameNamespace | string |
Description | string | A string describing the namespace of the Name property when NameNamespace includes the value 1, "Other".
ModelCorrespondence | string | CIM_StorageExtent.NameNamespace
PackageRedundancy | uint16 |
Description | string | How many physical packages can currently fail without data loss. For example, in the storage domain, this might be disk spindles.
ModelCorrespondence | string | CIM_StorageSetting.PackageRedundancyGoal, CIM_StorageSetting.PackageRedundancyMax, CIM_StorageSetting.PackageRedundancyMin
Primordial | boolean | false

Description

string

If true, "Primordial" indicates that the containing System does not have the ability to create or delete this operational element. This is important because StorageExtents are assembled into higher-level abstractions using the BasedOn association. Although the higher-level abstractions can be created and deleted, the most basic, (i.e. primordial), hardware-based storage entities cannot. They are physically realized as part of the System, or are actually managed by some other System and imported as if they were physically realized. In other words, a Primordial StorageExtent exists in, but is not created by its System and conversely a non-Primordial StorageExtent is created in the context of its System. For StorageVolumes, this property will generally be false. One use of this property is to enable algorithms that aggregate StorageExtent.ConsumableSpace across all, StorageExtents but that also want to distinquish the space that underlies Primordial StoragePools. Since implementations are not required to surface all Component StorageExtents of a StoragePool, this information is not accessible in any other way.

Purpose | string |
Description | string | A free form string describing the media and/or its use.
MappingStrings | string | MIB.IETF|HOST-RESOURCES-MIB.hrStorageDescr
SequentialAccess | boolean |
Description | string | Boolean set to TRUE if the Storage is sequentially accessed by a MediaAccessDevice. A TapePartition is an example of a sequentially accessed StorageExtent. StorageVolumes, Disk Partitions and LogicalDisks represent randomly accessed Extents.
ExtentStatus | uint16[] |

Description

string

StorageExtents have additional status information beyond that captured in the OperationalStatus and other properties, inherited from ManagedSystemElement. This additional information (for example, "Protection Disabled", value=9) is captured in the ExtentStatus property. 'In-Band Access Granted' says that access to data on an extent is granted to some consumer and is only valid when 'Exported' is also set. It is set as a side effect of PrivilegeManagementService.ChangeAccess or equivalent interfaces. 'Imported' indicates that the extent is used in the current system, but known to be managed by some other system. For example, a server imports volumes from a disk array. 'Exported' indicates the extent is meant to be used by some comsumer. A disk array's logical units are exported. Intermediate composite extents may be neither imported nor exported. 'Relocating' indicates the extent is being relocated.

ValueMap | string | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, .., 32768..65535
Values | string | Other, Unknown, None/Not Applicable, Broken, Data Lost, Dynamic Reconfig, Exposed, Fractionally Exposed, Partially Exposed, Protection Disabled, Readying, Rebuild, Recalculate, Spare in Use, Verify In Progress, In-Band Access Granted, Imported, Exported, Relocating, DMTF Reserved, Vendor Reserved

### Inherited Properties

Name | Data Type | Class Origin
--- | --- | ---
Availability | uint16 | CIM_LogicalDevice
Caption | string | CIM_ManagedElement
CommunicationStatus | uint16 | CIM_ManagedSystemElement
CreationClassName | string | CIM_LogicalDevice
Description | string | CIM_ManagedElement
DetailedStatus | uint16 | CIM_ManagedSystemElement
DeviceID | string | CIM_LogicalDevice
ElementName | string | CIM_ManagedElement
EnabledDefault | uint16 | CIM_EnabledLogicalElement
EnabledState | uint16 | CIM_EnabledLogicalElement
ErrorCleared | boolean | CIM_LogicalDevice
ErrorDescription | string | CIM_LogicalDevice
HealthState | uint16 | CIM_ManagedSystemElement
InstallDate | datetime | CIM_ManagedSystemElement
InstanceID | string | CIM_ManagedElement
LastErrorCode | uint32 | CIM_LogicalDevice
MaxQuiesceTime | uint64 | CIM_LogicalDevice
OperatingStatus | uint16 | CIM_ManagedSystemElement
OtherEnabledState | string | CIM_EnabledLogicalElement
PowerManagementSupported | boolean | CIM_LogicalDevice
PowerOnHours | uint64 | CIM_LogicalDevice
PrimaryStatus | uint16 | CIM_ManagedSystemElement
RequestedState | uint16 | CIM_EnabledLogicalElement
Status | string | CIM_ManagedSystemElement
StatusInfo | uint16 | CIM_LogicalDevice
SystemCreationClassName | string | CIM_LogicalDevice
SystemName | string | CIM_LogicalDevice
TimeOfLastStateChange | datetime | CIM_EnabledLogicalElement
TotalPowerOnHours | uint64 | CIM_LogicalDevice
TransitioningToState | uint16 | CIM_EnabledLogicalElement
AdditionalAvailability | uint16[] | CIM_LogicalDevice
AvailableRequestedStates | uint16[] | CIM_EnabledLogicalElement
IdentifyingDescriptions | string[] | CIM_LogicalDevice
OperationalStatus | uint16[] | CIM_ManagedSystemElement
OtherIdentifyingInfo | string[] | CIM_LogicalDevice
PowerManagementCapabilities | uint16[] | CIM_LogicalDevice
StatusDescriptions | string[] | CIM_ManagedSystemElement

## Class Methods

### Inherited Class Methods

Name | Return Type | Class Origin
--- | --- | ---
EnableDevice | uint32 | CIM_LogicalDevice
OnlineDevice | uint32 | CIM_LogicalDevice
QuiesceDevice | uint32 | CIM_LogicalDevice
RequestStateChange | uint32 | CIM_EnabledLogicalElement
Reset | uint32 | CIM_LogicalDevice
RestoreProperties | uint32 | CIM_LogicalDevice
SaveProperties | uint32 | CIM_LogicalDevice
SetPowerState | uint32 | CIM_LogicalDevice