HP XP P9000 Continuous Access Journal for Mainframe Systems User Guide

3. Wait until the non-suspended 3DC pair completes the resulting update and is in DUPLEX status.
4. Resynchronize the suspended 3DC pair.
Cautions
• If Cnt Ac-S Z interoperates with FC Z, specify Track as the unit of storage for the differential
data of the Cnt Ac-S Z pair.
• If Cnt Ac-S Z interoperates with FC Z, create the Cnt Ac-S Z pair without using the Cnt Ac-S
Z consistency group function.
• The data copied to the Cnt Ac-S Z P-VOL or Cnt Ac-J Z P-VOL by FC Z is asynchronously copied
with the initial copy operation to the Cnt Ac-S Z S-VOL or Cnt Ac-J Z S-VOL. Based on the
speed of the data copy to Cnt Ac-S Z S-VOL or Cnt Ac-J Z S-VOL, the concordance rate of the
Cnt Ac-S Z pair and Cnt Ac-J Z pair is calculated. Based on the copy processing performing
order of the FC Z relationship, initial copy processing of the Cnt Ac-S Z pair, and initial copy
processing of the Cnt Ac-J Z pair, performing of the Cnt Ac-S Z or Cnt Ac-J Z initial copy
operation may be forced to wait. In this case, the concordance speed of the Cnt Ac-S Z or
Cnt Ac-J Z pair may slow.
• If the delta resync operation interoperates with FC Z, use the delta resync operation function,
which is supported for the remote command device function.
• The relationship with FC Z can be created in the status under which the Cnt Ac-S Z initial copy
operation can be performed. If the P-VOL of the Cnt Ac-S Z pair in the status of Duplex or
Pending Duplex is assigned to the T-VOL of the relationship with FC Z, the initial copy operation
of Cnt Ac-S Z is performed. However, if the relationship of FC Z is created in the status under
which the Cnt Ac-S Z initial copy operation cannot be performed, the Cnt Ac-S Z pair may
be suspended.
Thin Provisioning
• THP V-VOLs can be used for either the Cnt Ac-J Z P-VOL or S-VOL, or both P-VOL and S-VOL.
• Only Cnt Ac-J Z pair volumes of volume type 3390-A can be used as a THP V-VOL.
• THP V-VOLs cannot be used for Cnt Ac-J Z journal volumes.
• When a THP V-VOL is used for a Cnt Ac-J Z P-VOL or S-VOL, the Cnt Ac-J Z of the allocated
pages for the THP V-VOL is included in the Cnt Ac-J Z licensed capacity. If the actual licensed
capacity exceeds the available licensed capacity, you may use Cnt Ac-J Z for 30 days. After
30 days, Cnt Ac-J Z pairs may only be split or released.
• When specifying a THP V-VOL that has allocated pages to a Cnt Ac-J Z 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 Z or that are in a Auto LUN
migration plan. To do so, proceed as follows:
1. Delete the Business Copy Z pair and disable the Auto LUN setting.
2. Create the Cnt Ac-J Z pair.
3. Re-create the Business Copy Z pair and the Auto LUN migration plan.
• Be aware that when a THP V-VOL is used as the Cnt Ac-J Z S-VOL, you might not be able to
update the Cnt Ac-J Z S-VOL because the capacity of the pool-VOL is full. In this instance, pair
status changes to Suspend.
• You can reclaim zero pages of the THP V-VOL to release the appropriate pages. Free pool
capacity increases after zero pages are reclaimed, but pages to which the control cylinders
Thin Provisioning 143