In the Selected Pairs table, you can change pair options by selecting it
and clicking Change Settings. Remove a pair by selecting it and clicking
Remove.
9. Click Finish.
10. In the Confirm window, review the settings and enter a task name in the
Task Name box.
11. Click Apply to save your settings in the system.
Splitting pairs
You can split a pair, which suspends data copying to the S-VOL.
When a pair is split:
• I/O writes from the host continue to the P-VOL, but stop to the S-VOL.
• Any current update copy operation completes to the S-VOL, ensuring data
consistency to the point of the split operation.
• Pair status changes to PSUS.
• The primary system records the updated tracks to the P-VOL that occur
after the split as differential data. This data is copied to the S-VOL when
the pair is resynchronized.
• You can set an option to block updates to the P-VOL while the pair is split.
This results in the P-VOL and S-VOL staying synchronized.
• Another option is to enable system write to the S-VOL from a host. The
secondary system records the updated tracks as differential bitmaps.
When the pair is resynchronized, the secondary system sends the
differential bitmaps to the primary system, which merges all differential
bitmaps to determine which tracks are out-of-sync.
Prerequisite information
• Pair status must be COPY or PAIR.
Procedure
1. Open the Remote Replication window.
In Hitachi Command Suite:
a. On the Resources tab, expand the Storage Systems tree.
b. Right-click the target storage system, and click Remote Replication.
In Device Manager - Storage Navigator:
a. Click Storage Systems, and then expand the Storage Systems
tree.
b. In the Storage Systems tree, click Replication > Remote
Replication.
2. In the Remote Replication window, click the TC Pairs tab, select the
pair to be split, and then click Split Pairs.
6-6
TC pair operations
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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