Comparison of snapshot features for supported snapshot types compares the features of the various types of snapshots that are supported in VxVM.
Full-sized instant snapshots are easier to configure and offer more flexibility of use than do traditional third-mirror break-off snapshots. For preference, new volumes should be configured to use snapshots that have been created using the
vxsnap command rather than using the
vxassist command. Legacy volumes can also be reconfigured to use
vxsnap snapshots, but this requires rewriting of administration scripts that assume the
vxassist snapshot model.
If storage space is at a premium, space-optimized instant snapshots can be configured with some reduction of supported functionality. For example, space-optimized snapshots cannot be turned into independent volumes, nor can they be moved into a separate disk group for off-host processing.