HP XP P9500 Storage - Manual (Page 129)

15. In the Pair Operation window, review the information in the Preview list. To change a selection,
right-click it, select Modify, and make your changes.
16. Click Apply to commit the pairs to the storage system.
Splitting pairs, creating and splitting pairs
Update copying continues until the pair is split. After the pair is split, updates continue to the S-VOL
but not to the T-VOL; data in the T-VOL is ensured at the time of the split. All update data are stored
in the differential bitmap for use when resynchronizing the pair.
You can use one of the following options to split a pair:
•
Steady split, which is a typical pair split operation in which any remaining differential data
from the S-VOL is copied to the T-VOL and then the pair is split.
•
Quick split, in which the pair is immediately split so that the T-VOL is immediately available
for read and write I/O. Any remaining differential data is copied to the T-VOL in the
background.
•
At-Time Split, in which all pairs in a copy group are split at the same time. Split time indicates
the time when you want to mirror S-VOL data in the T-VOLs. BCM is required.
•
Split all pairs in a consistency group. This operation requires PPRC and is similar to splitting
the copy group using BCM. However, with the PPRC operation, the split-time cannot be
specified, and the operation can only be used with Quick Split. Steady Split is unavailable
for this operation. For more information, see
“Pair operations using PPRC” (page 70) .
Prerequisite information
•
Pair status must be one of the following:
If you are splitting an existing pair, DUPLEX status. ◦
◦ If you are creating and immediately splitting a pair, SIMPLEX status.
•
For a split operation on an existing pair to complete faster, stop host access to the S-VOL.
•
If you are performing multiple split operations before clicking Apply, both Copy Pace and Split
Type that you set during the last operation are the settings that are used for all split operations
(in the Preview list) when you click Apply.
•
The split operation may take longer than normal if system option mode 459 is ON and the
T-VOL is an external volume. The reason is because after differential data is copied to cache,
it must also be destaged to the external storage system, which takes more time.
1. In the RWC, click Actions > Local Replications > BC Z/FC Z > Pair Operation.
2. Change to Modify mode by clicking the icon.
3. In the tree, in the Pair Operations window, select the CU image where the pairs or volumes
are located.
Related volumes are shown in the volume list. If a volume is already paired, pair information
is also shown.
4. Select the pair or pairs to be split, or select the volume to be split.
5. Right-click the selection and from the menu, click Split Pair.
Splitting pairs, creating and splitting pairs 129