Hewlett Packard Enterprise HPE XP7, User Manual, Page: 121 / 311

More information
Resynchronizing Fast Snap pairs on page 127
Split Pairs wizard on page 269
Splitting Fast Snap pairs to store snapshot data using RAID Manager
To specify more than one consistency group, define the same number of groups using the configuration
definition file for RAID Manager.
Procedure
Run the RAID Manager
pairsplit
command.
Workflow for storing snapshot data or clone pairs in
consistency groups
You can split pairs to store snapshot data or clone pairs for a consistency group using RAID Manager (the
consistency group pair-split function). This process explains how to use RAID Manager’s consistency
group pair-split to store snapshot data or clone pairs for each consistency group.
NOTE: If you cannot change the status of a pair in a Fast Snap consistency group, the
raidcom
modify snapshot -snapshot_data create
or
raidcom modify snapshot -snapshot_data
clone
command might return the error code EX_EWSTOT (timeout), and end abnormally. For details,
see Notes on using Fast Snap primary volumes as Continuous Access Synchronous, Business
Copy, or Continuous Access Journal pair volumes on page 206.
Use the following process to split Fast Snap pairs to store snapshot data or clone pairs:
1. (If the pairs are not created) Create two Fast Snap pairs and assign both pairs to the same
consistency group. To do this, using RAID Manager, run the following
raidcom
command twice using
an option to specify the consistency group ID:
raidcom add snapshot
A pair is created and defined in a consistency group. This group is the target of the consistency group
pair-split. The consistency group ID option you specified automatically enables the consistency group
pair-split.
2. Create the pair to store snapshot data for a group. To do this, using RAID Manager, specify the same
consistency group ID as step 1 to run either of the following
raidcom
commands:
raidcom modify snapshot -snapshot_data create
raidcom modify snapshot -snapshot_data clone
3. The storage system receives the command. Then it stores the snapshot data for the consistency
group that is the target of the consistency group pair-split, or clones pairs when a host issues a write
request to the Fast Snap pair's P-VOL that is assigned to the consistency group.
4. A host issues a write request to the Fast Snap pair’s P-VOL that is assigned to the consistency group.
5. The pairs are split and the snapshot data is stored.
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