Hewlett Packard Enterprise HPE XP7, User Manual, Page: 128 / 311

Procedure
1. Resynchronize the pair using forward resynchronization.
2. Store the data for the Fast Snap pair.
More information
Storing snapshot data or cloning pairs on page 119
Resynchronizing Fast Snap pairs on page 127
Deleting snapshot data
After writing data to a Fast Snap pair volume, if the capacity of the snapshot data exceeds the pool
capacity, the Fast Snap pair changes to the PSUE status (indicating a failure occurred). In the PSUE
status, the snapshot data is lost. Therefore, you cannot access the snapshot data. In this case, you
cannot create a new Fast Snap pair, and you must delete snapshot data which is no longer necessary. To
delete snapshot data, perform either of the following methods:
• You must have the Storage Administrator (Local Copy) role.
• In RAID Manager, use the
raidcom modify snapshot -snapshot_data resync
command.
• Deleting Fast Snap pairs
Deleting Fast Snap pairs deletes snapshot data stored in a pool and cancels the relationship between
the P-VOL and the S-VOL.
• Deleting snapshot data only
To delete snapshot data only, use the Resync Pairs window in RWC, or the
raidcom modify
snapshot -snapshot_data resync
command in RAID Manager to delete snapshot data or
restore Fast Snap pairs. If you deleted only snapshot data, the relationship between the P-VOL and
the S-VOL is maintained. If you delete only snapshot data, you can assign the MU numbers of the
snapshot data you deleted when you store snapshot data of the Fast Snap pair later. For details about
the
Resync Pairs window, see Restoring Fast Snap pairs on page 124 or Deleting Fast Snap pairs
on page 129.
When you delete snapshot data, the pair status changes to PAIR. Even if you update the primary volume
from the host, the snapshot data is no longer stored. To resume storing snapshot data, split the Fast Snap
pair again.
The amount of time required for deleting snapshot data depends on the following, even if the pair
synchronization ratio is 100 percent:
• The amount of pool capacity a pair is using.
• The number of pairs being operated concurrently.
The pair synchronization rate shows the rate that S-VOL data matches that of the next generation of the
S-VOL. If the S-VOL is the latest one, the synchronization rate is computed by comparing the S-VOL with
the P-VOL.
For the Fast Snap pair where the cascade attribute is enabled, the information displayed in
Synchronization Rate (%) of the View Pair Synchronization Rate window in RWC, or the
raidcom get
snapshot
command in RAID Manager varies depending on the pair status.
128 Deleting snapshot data