HP XP Racks - Manual (Page 45)

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