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HP XP7 Continuous Access Synchronous User Guide (TK911-96004)

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The following tables show Cnt Ac-S volumes and status with the Data Retention operations that can
be performed using Remote Web Console and RAID Manager.
Data Ret operationPAIR
status
Cnt Ac-S
Volume
Referring
access
attribute
Changing access attribute
S-VOL
Disable
ProtectRead OnlyRead/Write
YesYesYesYesYesSMPLP-VOL
YesYesYesYesYesCOPY
YesYesYesYesYesPAIR
YesYesYesYesYesPSUS
YesYesYesYesYesPSUE
YesYesYesYesYesSMPLS-VOL
YesNoYesYesYesCOPY
YesNoYesYesYesPAIR
YesYesYesYesYesPSUS
YesYesYesYesYesPSUE
Thin Provisioning
You can create a Continuous Access Journal pair by specifying a THP V-VOL (Thin Provisioning
virtual volume).Thin Provisioning virtual volumes (THP V-VOLs) can be assigned to both the Cnt
Ac-S P-VOL and S-VOL, or to one of them. However, the following restrictions apply:
• You can use THP V-VOLs that are also used in a Business Copy pair, or in a Auto LUN migration
plan. Before creating the Cnt Ac-S pair, delete the BC pair, or disable the Auto LUN setting.
After the pair is created, then re-create the pair or migration plan.
• When a THP V-VOL has pages allocated to an S-VOL, used pool capacity is temporarily larger
than the actual capacity because pages must be reallocated in the THP V-VOL. Therefore,
before creating the pair, make sure of the following:
◦ THP V-VOL pool capacity is sufficient.
◦ Pool-VOLs that are added to a pool are not blocked. If Pool-VOLs are blocked, restore
the volume status and then create the pair.
• Regarding page and license capacity:
◦ If a pair does not include a THP V-VOL, volume capacity is counted toward Cnt Ac-S
license capacity.
If a pair includes a THP V-VOL, only the allocated page capacity of volume capacity is
counted toward Cnt Ac-S license capacity.
If a THP V-VOL and a non-THP V-VOL are included in a pair, the page capacity and/or
license capacity counted in the P-VOL and the S-VOL may be different. This applies even
when both P-VOL and S-VOL include THP V-VOLs, because the page capacity of the P-VOL
or the S-VOL changes by a relocated pool or released page or other action.
For more information, see the HP XP7 Provisioning for Open Systems User Guide.
40 Sharing Continuous Access Synchronous volumes