HP XP Racks - Manual (Page 49)

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“BC Z pair resynchronization” (page 55) .
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“Sharing volumes with Auto LUN” (page 28) .
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“Workflow for ensuring data consistency” (page 49) .
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“Split Pairs wizard” (page 135) .
Pair splitting methods
You can use one of the following methods to split pairs:
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Steady Split: Copies the differential data to the S-VOL and then splits the pair. The split S-VOL
is identical to the P-VOL at the time of the split.
NOTE: You cannot Steady Split pairs that are assigned to a CG.
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Quick Split: The pair is split and then the differential data copy so that the S-VOL is immediately
available for read and write I/O. The XP7 storage system copies the remaining differential
data to the S-VOL.
BCM is required.
•
Consistency group pair-split: Simultaneously split all of the pairs in a CG. You can use this
method with RAID Manager, BCM, or IBM PPRC.
•
ATTIME Suspend: Simultaneously splits all of the pairs in a CG at a specific time. This method
can only be used with BCM.
Related topics
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“Quick Split and Steady Split performance planning” (page 17) .
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“Splitting pairs with CSUSPEND and PPRCOPY SUSPEND” (page 94) .
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“Business Copy Z pair user tasks using IBM PPRC” (page 91) .
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“Workflow for consistency group pair-split” (page 52) .
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“Using ATTIME Suspend to split CG pairs at a specific time” (page 23) .
Prerequisites for splitting BC Z pairs
The following are the prerequisites for splitting BC Z pairs:
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The pair status must be one of the following:
(If you are splitting an existing pair) “DUPLEX” or “PENDING” ◦
◦ (If you are creating and then immediately splitting a pair) the volumes are unpaired
◦ (The status of all pairs in a CG that you want to Quick Split) “DUPLEX”
•
If you are concerned with host I/O performance, check to make sure the I/O load is light.
For more information about checking I/O performance-related information, see the HP XP7
Remote Web Console User Guide.
Related topics
•
“Quick Split and Steady Split performance planning” (page 17)
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“Guidelines for maximizing host I/O performance” (page 18) .
Workflow for ensuring data consistency
Use the following workflow to ensure data consistency before splitting the pair:
Splitting BC Z pairs 49