Veritas FlashSnap Point-In-Time Copy Solutions 5.0.1 Administrators Guide, HP-UX 11i v3, First Edition, November 2009

Table 2-1
Creation of snapshot mirrors
Create snapshot mirrors for volumes
containing...
Point-in-time copy application
VxFS file systems for database datafiles to be
backed up.
Online database backup
See “About online database backup”
on page 41.
VxFS cluster file systems to be backed up.Off-host cluster file system backup
See “About off-host cluster file system
backup” on page 53.
VxFS file systems for database datafiles to be
replicated.
Decision support
See “About decision support”
on page 61.
Warning: To avoid data inconsistencies, do not use the same snapshot with different
point-in-time copy applications. If you require snapshot mirrors for more than
one application, configure at least one snapshot mirror that is dedicated to each
application.
If the existing volume was created before release 4.0 of VxVM, and it has any
attached snapshot plexes, is associated with any snapshot volumes, or has any
dedicated DRL logs, follow the procedure given in the section “Upgrading Existing
Volumes to Use Version 20 DCOs” in the “Administering Volumes” chapter of the
Veritas Volume Manager Administrator’s Guide. The procedure given in this
section assumes that no snapshot plexes, snapshot volumes, or DRL logs are
associated with the volumes.
Additional preparation activities
Depending on the type of snapshots that you want to create, you may need to
perform additional preparatory tasks.
When creating a full-sized instant snapshot, you can use one of the following two
methods:
■ Break off one or more spare plexes from the original volume to form a snapshot
volume with the required redundancy. These plexes must be in the SNAPDONE
state. (You can also break off named plexes of a volume that are in the ACTIVE
state, but that method is not described here.)
Setting up volumes for instant snapshots
Additional preparation activities
28