HP XP P9500 Storage - Manual (Page 108)

Prerequisite information
•
On registering split time:
◦ When you register the Split time, you can only perform Suspend or Delete pair operations.
Split time is rejected if the Paircreate, Split, or Resync operation is performed. If you want
to perform one of these operations, reset the registration of the Split time.
◦ The specified Split time is reset when power is switched off.
◦ The operation is performed when the read/write request—with a time stamp past the
specified Split time—is received. The Split operation may be delayed if no read/write
request is issued. When I/O does not occur, the Split operation is performed by the
storage system timer.
◦ If the Split time is registered, and if there is a pair in the consistency group that cannot
be split completely during the Split operation, the status of this pair remains the same as
before the Split operation.
Procedure 13 To perform the consistency group split operation
1. Define a consistency group for the Business Copy pairs that will be split using consistency
group split.
2. Specify the consistency group split option, then create the pairs.
3. Split the pairs in the consistency group. The pairs will be split simultaneously.
Suspending pair creation
When you suspend the creation of pairs (initial copy to the S-VOL), pair status becomes PSUE. The
S-VOL continues accepting write I/O operations from the P-VOL and marks the entire P-VOL track
as difference data. When a pairresync operation is performed on a suspended pair, the pair status
becomes COPY(RS)/COPY, and the entire P-VOL is copied to the S-VOL. While the pairresync
operation for a split pair can be very fast, the pairresync operation for a suspended pair takes as
long as the initial copy operation.
The storage system automatically suspends a pair when it detects an error condition related to an
update copy operation, or when it cannot keep the pair mirrored.
Procedure 14 To suspend pairs
1. In Remote Web Console, click Actions > Local Replications > BC/SS > Pair Operation.
2. Change to Modify mode by clicking the icon.
3. In the tree for the Pair Operations window, select the port or host group where the pairs or
volumes are located.
Related volumes display in the volume list. If a volume is already paired, pair information also
displays.
108 Pair operations (secondary window)