Creating point-in-time copies, Restoring pairs, Creating point-in-time copies restoring pairs – HP XP P9500 Storage User Manual
Page 74
4.
Select one or more mirrors.
5.
Right-click and select Mirror >Suspend Pair from the menu.
6.
In the Suspend Pair 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 Z 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 12 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 Suspend Pair 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.
Restoring pairs
Restoring 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.
•
The delta resync operation is performed using this procedure. Make sure to review
information for delta resync operation ” (page 151)
, 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 Simplex, the pair cannot be recovered by resuming
the pair. It must be deleted and created again.
•
Resuming 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 resume 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.
•
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 13 To restore a pair
1.
In the Remote Web Console main window, select Actions > Remote Copy > Continuous Access
Journal Z > Pair Operation.
2.
Click
to change the mode from View to Modify.
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Pair operations