HP XP P9000 Continuous Access Synchronous for Mainframe Systems User Guide

the differential data to the main system, which merges all differential data to determine which
tracks are out-of-sync.
Prerequisite information
• The pair must be in Pending or Duplex status.
Procedure 10 To suspend one or more pairs:
1. In Remote Web Console, click Actions > Remote Copy > Continuous Access Synchronous for
Mainframe > Pair Operation.
2. Change to Modify mode by clicking the icon.
3. In the tree, select CU or the CU grouping where the pair is located.
4. In the volume list, select the Cnt Ac-S Z pairs that you want to suspend.
5. Right-click, and select Suspend Pair from the menu. The Suspend Pair dialog box displays.
6. Select a option from the SSB [F/M=FB] list.
When this option is enabled (and PPRC support by host = Yes), the MCU will notify all attached
hosts (IEA494I message) that the pair was suspended. This option should always be enabled.
If PPRC support by host = No, the x’FB’ sense information will not be reported to the host,
even if the SSB (F/M = FB) suspend option is enabled.
Do not use the P-VOL failure suspend kind option if the P-VOL is required for system operation.
Make sure to use the S-VOL suspend kind option, so that the P-VOL continues accepting I/Os.
7. From the Suspend Kind list, select one of the following:
• S-VOL (default). This primary system accepts host write I/O (though still adheres to the
fence level in failure conditions).
This setting should be used when you need to keep the P-VOL online.
• P-VOL Failure. The primary system will reject host write I/O to the P-VOL while the pair
is suspended, regardless of fence level.
Use this option when you need to maintain synchronization of the pair while it is
suspended. Do not use this option if the P-VOL is required for system operation.
8. Click Set, and then Apply.
If the operation does not start normally, an error code displays in the Error Code column in the
Preview list. To display an error message, select the LDEV, right-click, and select Error Detail.
Resynchronizing pairs
While a Cnt Ac-S Z pair is suspended, the main system does not perform update copy operations
to the S-VOL. Resynchronizing a pair updates the S-VOL with differential data accumulated since
the suspension, so that its data is again identical with the P-VOL’s data. Update copy operations
begin again to the S-VOL.
When resynchronizing, Cnt Ac-S pairs can be migrated to External Storage Access Manager. See
the HP XP P9000 External Storage Access Manager User Guide.
Procedure 11 To resume one or more pairs:
1. In Remote Web Console, click Actions > Remote Copy > Continuous Access Synchronous for
Mainframe > Pair Operation.
2. Change to Modify mode by clicking the icon.
3. In the tree, select CU or the CU grouping where the pair is located.
4. In the list, select the pair volume that is suspended and that you want to resynchronize,
right-click, and select Resume Pair from the menu. The Resume Pair dialog box displays.
Resynchronizing pairs 69