Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

This command exits (with a return code of zero) when synchronization of the

snapshot volume is complete. The snapshot volume may then be moved to

another disk group or turned into an independent volume.

See “Controlling instant snapshot synchronization” on page 239.

If required, you can use the following command to test if the synchronization

of a volume is complete:

# vxprint [-g diskgroup] -F%incomplete snapvol

This command returns the value off if synchronization of the volume, snapvol,

is complete; otherwise, it returns the value on.

You can also use the vxsnap print command to check on the progress of

synchronization.

See “Displaying snapshot information” on page 252.

If you do not want to move the snapshot into a separate disk group, or to turn

it into an independent volume, specify the syncing=off attribute. This avoids

unnecessary system overhead.

For example, to turn off synchronization when creating the snapshot of the

volume, myvol, you would use the following form of the vxsnap make

command:

# vxsnap -g mydg make source=myvol/snapvol=snap1myvol\

/syncing=off

Use fsck (or some utility appropriate for the application running on the

volume) to clean the temporary volume’s contents.

For example, you can use this command with a VxFS file system:

# fsck -F vxfs /dev/vx/rdsk/diskgroup/snapshot

The specified device must have a valid entry in the /etc/fstab file.

To backup the data in the snapshot, use an appropriate utility or operating

system command to copy the contents of the snapshot to tape, or to some

other backup medium.

You now have the following options:

■ Refresh the contents of the snapshot. This creates a new point-in-time

image of the original volume ready for another backup. If synchronization

was already in progress on the snapshot, this operation may result in large

portions of the snapshot having to be resynchronized.

See “Refreshing an instant snapshot” on page 233.

Administering volume snapshots

Creating instant snapshots

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