Class CIM_CompositeExtentBasedOn
extends CIM_BasedOn

This specialization defines how data is striped across StorageExtents. Additionally, it includes information on distribution of check data so that the 'usual case' RAID devices can be created in one step.

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

Class Hierarchy

CIM_Dependency
   |
   +--CIM_AbstractBasedOn
   |
   +--CIM_BasedOn
   |
   +--CIM_CompositeExtentBasedOn

Direct Known Subclasses

Class Qualifiers

NameData TypeValue
Associationbooleantrue
ClassConstraintstringinv: self.Dependent.IsComposite = true
DescriptionstringThis specialization defines how data is striped across StorageExtents. Additionally, it includes information on distribution of check data so that the 'usual case' RAID devices can be created in one step.
UMLPackagePathstringCIM::Device::StorageExtents
Versionstring2.19.0

Class Properties

Local Class Properties

NameData TypeDefault ValueQualifiers
NameData TypeValue
BlockSizeuint64
DescriptionstringThe Dependent's BlockSize is limited by the Antecedent's. In SCSI SCC, this is equivalent to the NUMBER OF BYTES PER LBA_PS field in the RedundancyGroup P_Extent Descriptor.
MappingStringsstringMIF.DMTF|Protected Space Extent|001.4
ModelCorrespondencestringCIM_StorageExtent.BlockSize
PUnitstringbyte
UnitsstringBytes
LBAMappingIncludesCheckDataboolean
DescriptionstringTrue if the logical block mapping algorithm includes check data bytes. This property corresponds to the NOCHKSKIP attribute in the SCC-2 Volume Set PS_Extent Descriptor.
LBAsMappedByDecrementingboolean
DescriptionstringTrue if logical blocks in the underlying StorageExtents are mapped in decrementing order. This property corresponds to the INCDEC value in the SCSI SCC-2 Volume Set PS_Extent Descriptor.
NumberOfBlocksuint64
DescriptionstringThe total number of blocks that will be consumed on the Dependent Extent. This is limited by the Antecedent's NumberOfBlocks, but is included explicitly to provide for the DMTF MIF mapping. In SCSI SCC, this is equivalent to the NUMBER OF LBA_PS(s) field in the Volume Set PS_Extent Descriptor.
MappingStringsstringMIF.DMTF|Protected Space Extent|001.3
ModelCorrespondencestringCIM_StorageExtent.NumberOfBlocks
OrderIndexuint16
DescriptionstringOrder matters to composite extents. An example of the use of this property is when defining a RAID-0 striped array of 3 disks. The resultant RAID array is a composite extent that is dependent on (as described by CompositeExtentBasedOn) the StorageExtents that represent each of the 3 disks. The OrderIndex of each CompositeExtentBasedOn association from the disk Extents to the RAID array could be specified as 1, 2 and 3 to indicate the order in which the disk Extents are used to access the RAID data.
MappingStringsstringMIF.DMTF|Protected Space Extent|001.1
OverridestringOrderIndex
Requiredbooleantrue
UnitsBeforeCheckDataInterleaveuint64
DescriptionstringNumber of bytes of user data to skip before starting the check data interleave.
MappingStringsstringMIF.DMTF|Physical Extent|001.6
PUnitstringbyte
UnitsstringBytes
UnitsOfCheckDatauint64
DescriptionstringNumber of bytes to be reserved for check data.
MappingStringsstringMIF.DMTF|Physical Extent|001.7
PUnitstringbyte
UnitsstringBytes
UnitsOfUserDatauint64
DescriptionstringNumber of bytes to be reserved for user data.
MappingStringsstringMIF.DMTF|Physical Extent|001.8
PUnitstringbyte
UnitsstringBytes
UserDataStripeDepthuint64
DescriptionstringNumber of bytes which form the stripe size for the Dependent StorageExtent. If the CompositeExtent is concatenated instead of striped, then UserDataStripeDepth should be set to zero.
MappingStringsstringMIF.DMTF|Protected Space Extent|001.6
PUnitstringbyte
UnitsstringBytes

Association References

NameReference Class
AntecedentCIM_StorageExtent
DependentCIM_StorageExtent

Inherited Properties

NameData Type
EndingAddressuint64
StartingAddressuint64

Class Methods