HP XP P9500 Storage - Manual (Page 59)

Prerequisite information
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The pair must be in PAIR status.
Procedure 12 To split one or more pairs
1. In Remote Web Console, click Actions > Remote Copy > Continuous Access Synchronous >
Pair Operation.
2. Change to Modify mode by clicking the icon.
3. In the tree, select the port, host group, CU, or the CU grouping where the pair is located.
4. In the volume list, select the Continuous Access Synchronous pairs that you want to split.
To split a LUSE pair with a status of PDUB, perform the pairresync operation on the LUSE pair,
then split the pair. (PDUB indicates that the status of one or more individual LDEV pairs within
the LUSE pair is SMPL or PSUE (due to some error condition).
5. Right-click, and select Pairsplit-r from the menu. The Pairsplit-r dialog box displays.
6. From the S-VOL Write list, select one of the following:
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Enable, to cause host writes to be accepted by the S-VOL while the pair is split.
If using this option, you must also select S-VOL in the Suspend Kind option. This ensures
that P-VOL and S-VOL bitmaps are merged when the pair is resynchronized.
Do not use the P-VOL failure suspend kind option if the P-VOL is required for system
operation. Make sure to use the S-VOL suspend kind option, so that the P-VOL continues
accepting I/Os.
This option is not available when performing the split operation from the secondary system.
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Disable (default), to cause host input to be rejected by the S-VOL while the pair is split.
7. From the Suspend Kind list, select one of the following:
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S-VOL (default). The P-VOL accepts host write I/O (though still adheres to the fence level
in failure conditions).
This setting should be used when you need to keep the P-VOL online.
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P-VOL Failure. The primary system will reject host write I/O to the P-VOL while the pair
is split, regardless of fence level.
Use this option when you need to maintain synchronization of the pair while it is split.
Do not use this option if the P-VOL is required for system operation.
8. Click Set, and 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 LU, right-click, and select Error Detail.
Resynchronizing pairs
While a Continuous Access Synchronous pair is split, the primary system does not perform update
copy operations to the S-VOL. Re-synchronizing a pair updates the S-VOL with differential data
accumulated since the split, so that its data is again identical with the P-VOL’s data. Update copy
operations begin again to the S-VOL.
When re-synchronizing, Continuous Access Synchronous pairs can be migrated to External Storage
Access Manager. See the HP XP P9000 External Storage Access Manager User Guide.
Procedure 13 To resynchronize one or more pairs
1. In Remote Web Console, click Actions > Remote Copy > Continuous Access Synchronous >
Pair Operation.
2. Change to Modify mode by clicking the icon.
3. In the tree, select the port, host group, CU, or the CU grouping where the pair is located.
Resynchronizing pairs 59