Split And Create Pairs - HP StorageWorks P9000 - Disk Arrays User Manual

NOTE:
specify a different copy pace for new pairs in the Add Pair dialog box, the copy pace for the
existing Add Pair settings displayed in the Preview List will be also changed. The latest copy
pace specified in the Add Pair dialog box is always reflected to the storage system.
If you specify Slower, the pace of initial copying will be slow, but you can minimize the impact
of BC Z operations on storage system I/O performance. If you specify Faster, the initial copy
operation completes as quickly as possible, but it will cause a large impact on the I/O
operation.
9. Display the volumes available for T-VOLs by selecting the following filters from the Select T-VOL
box:
Select an LDKC (if selectable).
Select the appropriate CU image.
Select a Volume Type to display internal or external volumes. You can select both if
desired.
Select an Attribute to display volumes previously reserved as T-VOLs, or volumes that are
not reserved. You can select both if desired.
NOTE:
you can click Previous or Next to view all T-VOLs.
10. Select the volume to be the T-VOL from the volume list in the Select T-VOL box.
1 1. Click Set. This places the volume as the T-VOL in the pair list.
12. Add a second or third T-VOL to the same S-VOL as desired.
13. If you need to change a T-VOL, highlight the pair, then select the new volume in the T-VOL list
and click Change. The changed pair displays in the pair list.
14. Click OK when finished creating pairs.
The Pair Operation window reappears.
15. 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 pair(s) to the system.

Split and create 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
as differential bitmap for resynchronization.
NOTE: The S-VOL and T-VOL are synchronized only when the pair status changes from SP-Pend
or V-Split to Split. Due to the Business Copy Z asynchronous update copy operations, this status
transition can take several minutes.
If you want the T-VOLs you are intending to split to be identical to the S-VOLs, stop all write
operations to the S-VOLs before splitting the pairs. This ensures that there are no updates to the
S-VOLs while the split operations are synchronizing the T-VOLs to the S-VOLs.
Four options are available when splitting 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.
When the Preview List already holds some Add Pair operation settings and you
The T-VOL list displays up to 1,024 T-VOLs. If the number of T-VOLs exceeds 1,024,
Split and create pairs 27