Controlling instant snapshot synchronization


Controlling instant snapshot synchronization
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Synchronization of the contents of a snapshot with its original volume is not possible for space-optimized instant snapshots.

By default, synchronization is enabled for the vxsnap reattach, refresh and restore operations on instant snapshots. Otherwise, synchronization is disabled unless you specify the syncing=yes attribute to the vxsnap command.

Table: Commands for controlling instant snapshot synchronization shows the commands that are provided for controlling the synchronization manually.

Table: Commands for controlling instant snapshot synchronization

Command

Description

vxsnap [-g diskgroup] syncpause \ vol|vol_set

Pause synchronization of a volume.

vxsnap [-g diskgroup] syncresume \

vol|vol_set

Resume synchronization of a volume.

vxsnap [-b] [-g diskgroup] syncstart \

vol|vol_set

Start synchronization of a volume. The -b option puts the operation in the background.

vxsnap [-g diskgroup] syncstop \ vol|vol_set

Stop synchronization of a volume.

vxsnap [-g diskgroup] syncwait \ vol|vol_set

Exit when synchronization of a volume is complete. An error is returned if the vol or vol_set is invalid (for example, it is a space-optimized snapshot), or if the vol or vol_set is not being synchronized.

Note:

You cannot use this command to wait for synchronization of reattached plexes to complete.

The commands that are shown in Table: Commands for controlling instant snapshot synchronization cannot be used to control the synchronization of linked break-off snapshots.

The vxsnap snapwait command is provided to wait for the link between new linked break-off snapshots to become ACTIVE, or for reattached snapshot plexes to reach the SNAPDONE state following resynchronization.

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