Hewlett Packard Enterprise HPE XP7, User Manual, Page: 129 / 311

Deleting Fast Snap pairs
When you delete a pair, the P-VOL and the S-VOL change to SMPL(PD) and they are unpaired. When
volumes are unpaired, they are not displayed in the main window. After the deletion, you can use the
unpaired volumes in other pairs. You cannot create pairs in the SMPL(PD) status, and you cannot
allocate an S-VOL to snapshot data, or cancel or change the allocation. To shorten the time in the
SMPL(PD) status, delete snapshot data if any, and delete pairs after the pair status changes to PAIR.
When you set a snapshot group, if all pairs in a snapshot group are unpaired, the snapshot group is
automatically removed. Make sure that the snapshot group is removed before starting another pair task.
All snapshot data in a P-VOL must be deleted for there to be a decrease in the pool usage rate and an
increase in unused capacity.
The amount of time required for deletion depends on the following, even if the pair resynchronization rate
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 Remote Web Console, or the
information displayed by the
raidcom get snapshot
command in RAID Manager, varies depending
on the pair status. For details, see View Pair Synchronization Rate window on page 227.
If you cannot delete Fast Snap pairs with Remote Web Console, you can use the
raidcom delete
snapshot -range tree
command to forcibly delete all Fast Snap cascaded pairs in a snapshot tree.
For details about RAID Manager commands, see Pair tasks using RAID Manager or Remote Web
Console on page 194 and the HPE XP Storage RAID Manager Reference Guide .
NOTE: After deleting a Fast Snap pair, the number of pairs shown in the summary section in the Local
Replication window and in the list on the FS Root Volumes tab can be different. Wait until the
configuration has completed processing. If the numbers do not match, reload the configuration
information (see
Reloading Fast Snap configuration information on page 112).
NOTE: If the amount of snapshot data in selected P-VOLs or the total number of pairs in selected
snapshot groups exceeds 37,768, an error message appears when attempting to perform pair tasks.
Prerequisites
• You must have the Storage Administrator (Local Copy) role.
• The Fast Snap pair must be suspended ("PSUE" status), paired ("PAIR" status), or split ("PSUS"
status).
• In RAID Manager, use the
raidcom delete snapshot
command.
Delete Fast Snap pairs when you do not need them or when you want to delete snapshot data using the
Delete Pairs window in RWC, or the
raidcom delete snapshot
command in RAID Manager.
Deleting Fast Snap pairs 129