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Table 10 Whether access attribute can be changed when Cnt Ac-J P-VOL status is PAIR or COPY

Change access attribute toChange access attribute

from

S-VOL DisableProtectRead OnlyRead/Write

YesNoNo-Read/Write

YesYes-YesRead Only

Yes-YesYesProtect

-NoNoYesS-VOL Disable.

Thin Provisioning

• You can create a Continuous Access Journal pair by specifying a THP V-VOL (Thin Provisioning

virtual volume).

• THP V-VOLs can be used for either the Cnt Ac-J P-VOL or S-VOL, or both P-VOL and S-VOL.

• THP V-VOLs cannot be used for Cnt Ac-J journal volumes.

• When a THP V-VOL is used for a Cnt Ac-J P-VOL or S-VOL, the Cnt Ac-J of the allocated pages

for the THP V-VOL is included in the Cnt Ac-J licensed capacity. If the actual licensed capacity

exceeds the available licensed capacity, you may use Cnt Ac-J for 30 days. After 30 days,

Cnt Ac-J pairs may only be split or released.

• When specifying a THP V-VOL that has allocated pages to a Cnt Ac-J S-VOL, be aware that

used pool capacity will become temporarily larger than the actual capacity, because pages

must be reallocated in the THP V-VOL. Therefore, before creating the pair:

◦ Make sure that THP V-VOL pool capacity is sufficient.

◦ Make sure that the pool-VOLs, which are added to a pool, are not blocked. If the

pool-VOLs are blocked, restore the volume status and then create the pair.

• You can use THP V-VOLs that are also used by Business Copy or that are in a Auto LUN

migration plan. To do so, proceed as follows:

1. Delete the Business Copy pair and disable the Auto LUN setting.

2. Create the Cnt Ac-J pair.

3. Re-create the Business Copy pair and the Auto LUN migration plan.

• Be aware that when a THP V-VOL is used as the Cnt Ac-J S-VOL, you might not be able to

update the Cnt Ac-J S-VOL because the capacity of the pool-VOL is full. In this instance:

◦ The pair is suspended.

◦ With RAID Manager, the Cnt Ac-J pair status changes to PFUS.

◦ In Remote Web Console, the Cnt Ac-J pair status changes to PSUS.

External Storage Access Manager (ESAM)

You can use the ESAM S-VOL as a Cnt Ac-J P-VOL. This configuration benefits the ESAM pair if

data in the P-VOL and S-VOL become inconsistent due to a disaster. In this case, you can recover

the data from the split Cnt Ac-J S-VOL.

136 Sharing volumes

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Hp XP P9500 Storage User Manual Page 136