HP XP P9500 Storage - Manual (Page 43)

Prerequisite information for splitting pairs
•
Pair status must be one of the following:
PAIR when splitting an existing pair. ◦
◦ SMPL, when creating and immediately splitting an L1 pair
◦ To split an L1 pair that has L2 pairs, check “Status for L1, L2 pairs and operations permitted
” (page 51) .
◦ PSUS for the L1 pair when splitting, or creating and immediately splitting, an L2 pair
•
The primary and secondary volume are synchronized when pair status changes from
COPY(SP)/COPY or PSUS(SP)/PSUS to PSUS.
•
To ensure that the data in the primary volume matches data in the secondary volume after the
pair split, stop write operations from the host server to the primary volume before running the
operation.
•
For a split operation to complete faster on an existing pair, stop host access to the primary
volume before starting the split.
Related information
•
“PSUS, performance, and SOM 459” (page 43)
•
“Status for L1, L2 pairs and operations permitted ” (page 51)
PSUS, performance, and SOM 459
In PSUS(SP)/PSUS or COPY(SP)/COPY status, performance may be affected, depending on the
following:
•
Whether system option mode 459 is enabled
•
Whether the secondary volume is an external or internal volume
•
Whether the secondary volume is a volume in a Dynamic Provisioning pool
The following table shows the affects of these conditions.
PSUS(SP)/PSUS or COPY(SP)/COPY status Secondary volume System option mode 459
Pair status changes to PSUS(SP)/PSUS after differential
data is copied to the cache in the storage system Internal volume OFF
External volume
Internal volume ON
Pair status changes to PSUS after differential data is
copied to the cache in the storage system and destage
to the external storage system has completed. External volume
* Indicates a Dynamic Provisioning pool volume.
Splitting pairs
1. In the tree, click Replications > Local Replications.
2. In the Pairs tab, select the pair you want to split, then click Split Pairs.
3. In the Split Pairs window, select a Split Type — Quick Split or Steady Split. See “Types of split
operations” (page 42) for more information.
Pair split 43