HP XP P9500 Storage - Manual (Page 76)

To resynchronize a mirror
1. In Remote Web Console, select Actions > Remote Copy > Continuous Access Journal Z >
Journal Operation.
2. Click to change the mode from View to Modify.
3. In the tree, expand Registered then select the desired LDKC. Journals display in the tree, Mirrors
display in the right-side pane.
4. In the list, select a pair to resume, perform the delta resync operation, or change the status
from Hold(Failure) to Hold, right-click and select Mirror > Resume Pair from the menu. The
Pairsplit-r dialog box displays.
•
If Stopped is selected, all pairs in the mirror is resynchronized and then the data copy
restarts.
•
If Hold or Holding is selected, the delta resync operation is performed on all pairs in the
mirror.
•
If Hold(Failure) is selected, the status of the mirror is changed to Hold.
5. See the Preview list to check the mirrors that you want to restore.
•
If you want to cancel restoring a mirror, select and right click the mirror and then click
Cancel.
•
If necessary, you can repeat steps 2 to 5 to specify other mirrors.
6. Click Apply to restore the mirror(s). If an error occurs, the error code appears in the rightmost
column of the Preview list. To view detailed information about the error, right click the error
code and select Error Detail.
Delete a pair
When you delete a pair, the Continuous Access Journal Z relationship between the P-VOL and
S-VOL is released. The data volumes and their data remain, but in Simplexstatus.
Prerequisite information
•
This operation can be performed from either the primary or secondary systems.
•
When a pair deletion is initiated, transfer of differential data from P-VOL to S-VOL is completed,
then the pair relationship is deleted and the volume’s status becomes Simplex.
•
A pair can be deleted regardless of its status. However, data consistency is not guaranteed
unless status is Duplex.
•
If the operation fails, the P-VOL nevertheless becomes Simplex. Transfer of differential data to
S-VOL is terminated.
•
Best practice is to perform pair deletion when I>O load is low. This reduces impact on
performance. Operations on multiple pairs with different statuses and in the same mirror may
result in suspension during high periods of write I/O.
•
In a delta resync configuration, if you release the Continuous Access Synchronous Z pair, the
Continuous Access Journal Z delta resync pair will be released as well. If you release the
Continuous Access Journal Z pair, the Continuous Access Journal Z delta resync S-VOL is
released.
•
If Continuous Access Journal Z secondary data volumes are physically attached to the same
host server(s) as the Continuous Access Journal Z primary data volumes, the following problem
can occur:
When a Continuous Access Journal Z pair is released, the older, secondary data volume is
usually offline. If the host is then restarted, the system administrator may be offered both
76 Pair operations