HP XP7 Continuous Access Synchronous User Guide (TK911-96004)

System behavior
Note the following behaviors for split pairs:
• The primary system stops performing update operations to the S-VOL. It may or may not
continue accepting write I/Os to the P-VOL depending on the P-VOL fence level setting.
• If an update fails, the primary system reports a unit check and notifies the host that Write fails.
This ensures that both the host system and application program regard the write operation to
the P-VOL as failed.
• If the primary system accepts subsequent write I/Os for a split P-VOL, the system records the
updated data in the P-VOL tracks as differential data. When a split pair is resynchronized,
the primary system copies the out of sync P-VOL tracks to the S-VOL as differential data.
Monitoring Cnt Ac-S pair synchronous rate
You can check on the percentage of synchronized data between the P-VOL and S-VOL.
Procedure 16 To check a pair's synchronous rate
1. In the Storage Systems tree, click Replication > Remote Replication.
2. Click the Cnt Ac-S Pairs tab, then select the pair whose rate you want to display.
3. Click Actions > Remote Replications > View Pair Synchronous Rate.
Clicking Refresh displays the latest synchronous rate.
Monitoring Cnt Ac-S operations history
You can review a pair's history of operations, including the operation's description, date and time
it took place, primary and secondary system information, and other details.
Procedure 17 To view a pair's operation history
1. In the Storage Systems tree, click Replication.
2. Click View Histories > Remote Replication.
3. In the Histories window, for Copy Type, click Cnt Ac-S.
Monitoring Cnt Ac-S pair synchronous rate 63