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Chapter
9
Administering volume
snapshots
Veritas Volume Manager (VxVM) provides the capability for taking an image of a
volume at a given point in time. Such an image is referred to as a volume
snapshot. You can also take a snapshot of a volume set as described in “Creating
instant snapshots of volume sets” on page 334.
Volume snapshots allow you to make backup copies of your volumes online with
minimal interruption to users. You can then use the backup copies to restore
data that has been lost due to disk failure, software errors or human mistakes, or
to create replica volumes for the purposes of report generation, application
development, or testing.
For an introduction to the volume snapshot feature, see “Volume snapshots” on
page 63. More detailed descriptions of each type of volume snapshot and the
operations that you can perform on them may be found in the following
sections:
■ “Traditional third-mirror break-off snapshots” on page 305
■ “Full-sized instant snapshots” on page 307
■ “Space-optimized instant snapshots” on page 309
■ “Emulation of third-mirror break-off snapshots” on page 310
■ “Linked break-off snapshot volumes” on page 311
■ “Cascaded snapshots” on page 312
■ “Creating multiple snapshots” on page 317
■ “Restoring the original volume from a snapshot” on page 317