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
restore operations on instant snapshots. Otherwise, synchronization is disabled unless you specify the
syncing=yes attribute to the
Commands for controlling instant snapshot synchronization shows the commands that are provided for controlling the synchronization manually.
The commands that are shown in Commands for controlling instant snapshot synchronization cannot be used to control the synchronization of linked break-off snapshots.
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.
See "Creating and managing linked break-off snapshot volumes" on page 337.
See "Reattaching an instant snapshot" on page 343.
See "Reattaching a linked break-off snapshot volume" on page 344.
The following optional arguments to the
-o option are provided to help optimize the performance of synchronization when using the
syncstart operations with full-sized instant snapshots:
Specifies the size of each I/O request that is used when synchronizing the regions of a volume. Specifying a larger size causes synchronization to complete sooner, but with greater impact on the performance of other processes that are accessing the volume. The default size of 1m (1MB) is suggested as the minimum value for high-performance array and controller hardware. The specified value is rounded to a multiple of the volume's region size.
Specifies the delay in milliseconds between synchronizing successive sets of regions as specified by the value of
Options may be combined as shown in the following examples:
vxsnap -g mydg -o iosize=2m,slow=100 make \
vxsnap -g mydg -o iosize=10m,slow=250 syncstart snap2myvol
slow parameters are not supported for space-optimized snapshots.