Splitting Consistency Group Pairs With At-Time Split; Suspend Pair Creation - HP StorageWorks P9000 User Manual

Select an Attribute to display volumes previously reserved as S-VOLs, or volumes that are
not reserved. You can select both if desired.
You can also filter by existing pairs that may be used for creating L2 pairs (Pair check
box).
12. Select the volume to be the S-VOL from the volume list in the Select S-VOL box.
13. Do one of the following:
To create and split an L1 pair, click Set. This adds the pair to the Volume List as an L1
pair.
To create and split an L2 pair, click Cascade. This adds the pair to the Volume List as an
L2 pair.
14. To replace an S-VOL in the volume/pair list, select the pair, select the desired S-VOL in the
Select S-VOL box., and click Change.
15. To complete the operation, click OK.
The Pair Operation window re-appears.
16. Review the information in the Preview list. To change a selection, right-click it, select Modify,
and make your changes.
17. Click Apply to commit the operation to the system.

Splitting consistency group pairs with At-Time Split

Using RAID Manager, you can split all the Business Copy pairs in a consistency group at a specified
time. This is done using the At-Time Split feature.
Prerequisite Information
On registering split time:
◦ When you registered 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.
◦
If the Split time is registered, the Split operation is performed when the read/write
◦
request—with a time stamp past the 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.
NOTE: The At-Time Split option is disabled if pair operations are performed from Remote Web
Console following the creation of the pairs in RAID Manager. Thus, At-Time Split operates correctly
only when all pair operations are performed using RAID Manager.
To perform the At-Time Split operation:
1. Define a consistency group for the Business Copy pairs that will be split using At-Time Split.
2. Specify the At-Time Split option, then create the pairs.
3. Split the pairs in the consistency group. The pairs will be split simultaneously.

Suspend pair creation

When you suspend the creation of pairs (copy to the S-VOL of the pair), pair status becomes PSUE.
The S-VOL continues accepting write I/O operations to 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
30 Performing pair operations