HP XP7 Business Copy User Guide (TK913-96002)

2. In the Select Secondary Volumes window of the Create Pairs wizard, click Change Options.
3. In the Change Options dialog box, complete the following and then click OK:
• For Split Type, select a split type.
Values:
- Non Split: The pair is not split.
- Quick Split: The pair is split and then the differential data is copied so that the S-VOL is
immediately available for read and write I/O. Any remaining differential data is copied
to the S-VOL in the background.
- Steady Split: Differential data is copied and then the pair is split.
Default: Non Split
• For Copy Pace, select the rate at which you want the XP7 storage system to copy data.
Values:
- Slower: Improved host server I/O performance but slower processing speed.
- Medium: Average processing speed and host server I/O performance.
- Faster: Faster processing speed but slower host server I/O performance.
Default: Medium
Related topics
• “Pair splitting methods” (page 46).
Splitting BC pairs
Splitting BC pairs separates and unpairs the P-VOL and S-VOLs, stops host updates to the P-VOL
and periodic copying to the S-VOL, and makes the S-VOL data available to secondary software
applications.
Splitting an BC pair ensures data consistency and ensures that the data in the S-VOL at the time
of the split is consistent and usable. The S-VOL contains a mirror image of the original volume at
that point in time. It is available for read/write access by secondary host applications.
The P-VOL for a split pair continues to be updated, but the S-VOL remains unchanged. The differential
data that accrues while the pair is split is stored the differential bitmaps. Changes to the P-VOL
and S-VOLs are managed in these differential bitmaps. The differential data accrues until you
resynchronize the pair, which copies the differential data to the S-VOL.
Splitting BC pairs 45