HP XP P9500 Storage - Manual (Page 59)

Resynchronize pairs
While a Continuous Access Synchronous Z pair is suspended, the main system does not perform
update copy operations to the R-VOL. Resynchronizing a pair updates the R-VOL with differential
data accumulated since the suspension, so that its data is again identical with the M-VOL’s data.
Update copy operations begin again to the R-VOL.
Procedure 7 To resynchronize a pair
1. On the menu bar, click Actions > Remote Copy > Continuous Access Synchronous for Mainframe
> Pair Operation. The Pair Operation window opens.
2. Change to Modify mode by clicking the icon.
3. In the tree, select CU or the CU grouping where the pair is located.
4. In the list, select the pair volume that is suspended and that you want to resynchronize,
right-click, and select Resume Pair from the menu. The Resume Pair dialog box displays.
5. If you are changing the M-VOL Fence Level, select a new fence level from the list. This is
optional. See fence level descriptions in the prerequisites for
“Create pairs” (page 55) .
6. From the Copy Pace list, select the number of the tracks, 1-15, for the resync operation(s). The
default is 15. For more on copy pace levels, see the descriptions in
“Create pairs” (page 55) .
7. From the Priority list, enter the desired priority, or scheduling order, for the resync operation.
You can set priority from 0 to 256. The default is 32. For more on priority, see the descriptions
in
“Create pairs” (page 55) .
8. From the Time Stamp list, select whether or not the host I/O timestamp is transferred from M
VOL to R VOL.
9. Click Set then Apply.
If the operation does not start normally, an error code displays in the Error Code column in
the Preview list. To display an error message, select the LDEV, right-click, and select Error
Detail.
10. Verify that the operation completed successfully and that pair status is Duplex on the Pair
Operation window. You can update the progress of the operation by clicking File/Refresh.
Delete pairs
A Continuous Access Synchronous Z pair can be released or deleted. Doing this deletes the
Continuous Access Synchronous Z relationship, though not the volumes or their data.
Prerequisite information
•
When it is no longer necessary to maintain a remote copy of the M-VOL, delete a pair from
the main system only. All update operations are stopped and pair status for both the M-VOL
and R-VOL changes to Simplex.
When a pair is released, the main system continues to accept write I/O to the former M-VOL
but does not keep track of the updates.
•
Delete a pair from the remote system only for disaster recovery purposes. When you do this,
the remote system changes the R-VOL pair status to Simplex, but does not change the M-VOL’s
status. When the main system performs the next Continuous Access Synchronous Z operation
for the pair, the main system detects that the R-VOL status is Simplex, and then changes M-VOL
status to suspended-delete pair to RCU.
The CDELPAIR TSO command can be used to release Continuous Access Synchronous Z pairs
from the MCU.
To restart a pair that was released from the remote system, you must release the pair from the
main system, then create the pair from the main system.
Resynchronize pairs 59