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305Administering volume snapshots
Traditional third-mirror break-off snapshots
Traditional third-mirror break-off snapshots
The traditional third-mirror break-off volume snapshot model that is supported
by the
vxassist command is shown in Figure 9-1. This also shows the
transitions that are supported by the
snapback and snapclear commands to
vxassist.
Figure 9-1 Third-mirror snapshot creation and usage
The
vxassist snapstart command creates a mirror to be used for the snapshot,
and attaches it to the volume as a snapshot mirror. (The
vxassist snapabort
command can be used to cancel this operation and remove the snapshot mirror.)
Note: As is usual when creating a mirror, the process of copying the volume’s
contents to the new snapshot plexes can take some time to complete. For
methods of making snapshot plexes immediately available, see “Full-sized
instant snapshots” on page 307 and “Space-optimized instant snapshots” on
page 309.
When the attachment is complete, the
vxassist snapshot command is used to
create a new snapshot volume by taking one or more snapshot mirrors to use as
Original
volume
Refresh on
snapback
vxassist snapstart
vxassist snapback
vxassist snapclear
Original
volume
Independent
volume
Back up to disk,
tape or other
media, or use to
create replica
database or file
system.
Backup
Cycle
Start
vxassist snapshot
Snapshot
volume
Snapshot
mirror