Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

Table 1-1
Comparison of snapshot features for supported snapshot types
Break-off
(vxassist or
vxsnap)
Space-optimized
instant
(vxsnap)
Full-sized
instant
(vxsnap)
Snapshot feature
NoYesYesImmediately available for use on
creation
NoYesNoRequires less storage space than
original volume
YesNoYesCan be reattached to original volume
YesYesYesCan be used to restore contents of
original volume
NoYesYesCan quickly be refreshed without being
reattached
NoNoYesSnapshot hierarchy can be split
YesNoYesCan be moved into separate disk group
from original volume
YesNoYesCan be turned into an independent
volume
YesYesYesFastResync ability persists across
system reboots or cluster restarts
NoNoYesSynchronization can be controlled
YesNoYesCan be moved off-host
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.
FastResync
Note: Only certain Storage Foundation products have a license to use this feature.
65Understanding Veritas Volume Manager
FastResync