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331Administering volume snapshots
Creating instant snapshots
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 337 for
details.
■ Reattach some or all of the plexes of the snapshot volume with the
original volume. See “Reattaching an instant snapshot” on page 338 for
details.
■ Restore the contents of the original volume from the snapshot volume.
You can choose whether none, a subset, or all of the plexes of the
snapshot volume are returned to the original volume as a result of the
operation. See “Restoring a volume from an instant snapshot” on
page 340 for details.
■ Dissociate the snapshot volume entirely from the original volume. This
may be useful if you want to use the copy for other purposes such as
testing or report generation. If desired, you can delete the dissociated
volume. See “Dissociating an instant snapshot” on page 340 for details.
■ If the snapshot is part of a snapshot hierarchy, you can also choose to
split this hierarchy from its parent volumes. See “Splitting an instant
snapshot hierarchy” on page 341 for details.
Creating and managing linked break-off snapshot volumes
Note: Break-off snapshots are suitable for write-intensive volumes, such as
database redo logs.
For linked break-off snapshots, you must prepare a volume that is to be used as
the snapshot volume. This must be the same size as the volume for which the
snapshot is being created, and it must also have the same region size. See
“Creating a volume for use as a full-sized instant or linked break-off snapshot”
on page 323 for details.
The attributes for a snapshot are specified as a tuple to the
vxsnap make
command. This command accepts multiple tuples. One tuple is required for each
snapshot that is being created. Each element of a tuple is separated from the
next by a slash character (/). Tuples are separated by white space.
To create and manage a linked break-off snapshot
1 Use the following command to link the prepared snapshot volume, snapvol,
to the data volume:
# vxsnap [-g diskgroup] [-b] addmir volume mirvol=snapvol \