// Copyright (c) 2008 DMTF.  All rights reserved.
   [Association, Version ( "2.19.0" ), 
    ClassConstraint { "inv: self.Dependent.IsComposite = true" }, 
    UMLPackagePath ( "CIM::Device::StorageExtents" ), 
    Description ( 
       "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." )]
class CIM_CompositeExtentBasedOn : CIM_BasedOn {

      [Override ( "Antecedent" ), 
       Min ( 1 ), 
       Description ( "The underlying StorageExtent." )]
   CIM_StorageExtent REF Antecedent;

      [Override ( "Dependent" ), 
       Description ( 
          "The StorageExtent which is built on the StorageExtent." )]
   CIM_StorageExtent REF Dependent;

      [Required, Override ( "OrderIndex" ), 
       Description ( 
          "Order 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." ), 
       MappingStrings { "MIF.DMTF|Protected Space Extent|001.1" }]
   uint16 OrderIndex;

      [Description ( 
          "True 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." )]
   boolean LBAsMappedByDecrementing;

      [Description ( 
          "True 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." )]
   boolean LBAMappingIncludesCheckData;

      [Description ( 
          "The 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." ), 
       MappingStrings { "MIF.DMTF|Protected Space Extent|001.3" }, 
       ModelCorrespondence { "CIM_StorageExtent.NumberOfBlocks" }]
   uint64 NumberOfBlocks;

      [Description ( 
          "The 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." ), 
       Units ( "Bytes" ), 
       MappingStrings { "MIF.DMTF|Protected Space Extent|001.4" }, 
       ModelCorrespondence { "CIM_StorageExtent.BlockSize" }, 
       PUnit ( "byte" )]
   uint64 BlockSize;

      [Description ( 
          "Number 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." ), 
       Units ( "Bytes" ), 
       MappingStrings { "MIF.DMTF|Protected Space Extent|001.6" }, 
       PUnit ( "byte" )]
   uint64 UserDataStripeDepth;

      [Description ( 
          "Number of bytes of user data to skip before starting the "
          "check data interleave." ), 
       Units ( "Bytes" ), 
       MappingStrings { "MIF.DMTF|Physical Extent|001.6" }, 
       PUnit ( "byte" )]
   uint64 UnitsBeforeCheckDataInterleave;

      [Description ( 
          "Number of bytes to be reserved for check data." ), 
       Units ( "Bytes" ), 
       MappingStrings { "MIF.DMTF|Physical Extent|001.7" }, 
       PUnit ( "byte" )]
   uint64 UnitsOfCheckData;

      [Description ( "Number of bytes to be reserved for user data." ), 
       Units ( "Bytes" ), 
       MappingStrings { "MIF.DMTF|Physical Extent|001.8" }, 
       PUnit ( "byte" )]
   uint64 UnitsOfUserData;


};