Creating point-in-time copies, Resynchronizing pairs – HP XP P9500 Storage User Manual
Page 60
4.
Select one or more mirrors.
5.
Right-click and select Mirror >Pairsplit-r from the menu.
6.
In the Pairsplit-r dialog box, follow the steps for the each option in
Note that Mirror in the Range field cannot be changed for this operation.
You can verify the Stopped status of the mirror when the mirror split operation is completed.
Creating point-in-time copies
Continuous Access Journal allows you to make Point-in-Time (PiT) copies of volumes in the same
journal. Point-in-Time describes a copy of data made when you it.
Prerequisite information
Review the prerequisite information in
.
Procedure 9 To make PiT copies of the volumes in a journal
1.
Stop all write I/Os from hosts to P-VOLs in the journal.
2.
Split the mirror using the Pairsplit-r dialogue box, specifying Mirror for Range and Flush for
Suspend Mode.
3.
When the status of all pairs in the journal changed to Suspend, the operation is completed.
You can resume write I/Os to the P-VOLs.
Resynchronizing 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 PSUS or PSUE.
•
The delta resync operation is performed using this procedure. Make sure to review
information for delta resync operation ” (page 147)
, in addition to reviewing the following
prerequisites.
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 SMPL, the pair cannot be recovered by
re-synchronizing. 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 resync pairs in PAIR status and other than PAIR 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.
•
The secondary system and path group ID cannot be changed during this operation. To change
the secondary system, delete the pair and create it again.
Procedure 10 To resync a pair
1.
In the Remote Web Console main window, select Actions > Remote Copy > Continuous Access
Journal > Pair Operation.
2.
Click
to change the mode from View to Modify.
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Pair operations