HP XP7 Storage - Manual (Page 74)

Resynchronizing Cnt Ac-J Z pairs
Resynchronizing a pair updates the S-VOL with differential data that accumulated since the pair
was split. After the pair is resynchronized, the S-VOL is again updated via the journals.
Prerequisites for resynchronizing pairs
•
This operation is performed from the primary system only.
•
Pair status must be Suspend.
If pair status is Hold, Holding, or Hlde, use the resynchronizing mirrors operation (see
“Resynchronizing mirrors ” (page 75) ).
•
Pairs suspended by the system (Suspend status) can be resynchronized after the error causing
the suspension is corrected.
The following additional information may be useful before beginning the procedure:
•
Performing the operation on a pair in Hlde status changes the status to Hold.
•
The primary system does not resynchronize a pair that is suspended due to an error until the
cause of error is resolved.
•
If P-VOL status is Failure and S-VOL status is unpaired, the pair cannot be recovered by
resynchronizing. It must be deleted and created again.
•
Resynchronizing pairs when I/O load is low reduces impact on performance. Operations on
multiple pairs in the same mirror with different statuses may results in suspension during periods
of heavy write I/O.
•
If you resynchronize pairs in Duplex status and other than Duplex status in the same mirror,
an unexpected suspension could occur during the operation under heavy I/O load conditions.
You can estimate whether the I/O load is heavy or not from frequency of host I/Os. This
operation should be performed under light I/O load conditions.
Procedure 13 To resynchronize a pair
1. In the Storage Systems tree, click Replication > Remote Replication, and then select the Cnt
Ac-J Pairs tab.
2. From the Actions menu, click Remote Replication > Resync Pairs.
3. In the Resync Pairs window, review the pairs in the Selected Pairs table. You can remove a
pair from the table by selecting it and clicking Cancel.
74 Cnt Ac-J Z pair operations