Veritas FlashSnap Point-In-Time Copy Solutions 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

Chapter
2
Setting up volumes for
instant snapshots
This chapter describes how to make volumes ready for instant snapshot
creation. These may be volumes that you want to back up, or that you want to
use for decision support or reporting.
If a snapshot volume is to be used on the same host, and will not be moved to
another host for off-host processing, you can use space-optimized instant
snapshots rather than full-sized instant snapshots. Depending on the
application, space-optimized snapshots typically require 10% of the disk space
that is required for full-sized instant snapshots.
For more information about administering instant snapshots and FastResync,
see the Veritas Volume Manager Administrator’s Guide.
Table 2-1 summarizes which volumes require the creation of snapshot mirrors
for backup, decision support, and database error recovery.
Table 2-1 Creation of snapshot mirrors
Point-in-time copy
application
Create snapshot mirrors for volumes containing...
Online database backup VxFS file systems for database datafiles to be backed up.
Off-host cluster file system
backup
VxFS cluster file systems to be backed up.
Decision support VxFS file systems for database datafiles to be replicated.