VERITAS Storage Foundation 4.1 Oracle Administrator's Guide

Creating a Snapplan (dbed_vmchecksnap) Prerelease 8 September 2005, 8:55am
222 VERITAS Storage Foundation for Oracle Administrator’s Guide
When you first run dbed_vmchecksnap, use the -o setdefaults option to create a
snapplan using default values for variables. You may then edit the file manually to set the variables
for different snapshot scenarios.
Note You cannot access Database FlashSnap commands (dbed_vmchecksnap,
dbed_vmsnap, and dbed_vmclonedb) with the VxDBA menu utility.
Prerequisites
◆ Storage must be configured as specified in “Preparing Hosts and Storage for Database
FlashSnap” on page 204.
◆ You must be the Oracle database administrator.
◆ The disk group must be version 110 or later. For more information on disk group versions, see
the vxdg(1M) manual page.
◆ Be sure that a DCO and DCO volume are associated with the volume for which you are
creating the snapshot.
◆ Snapshot plexes and their associated DCO logs should be on different disks than the original
plexes, and should be configured correctly for creating snapshots by the system administrator.
◆ Persistent FastResync must be enabled on the existing database volumes and disks must be
assigned for the snapshot volumes.
◆ The database must be running in archive log mode. Archive log mode is set in the Oracle
initialization parameter file (init.ora).
◆ The Oracle database must have at least one mandatory archive destination. For further details,
see “Establishing a Mandatory Archive Destination” on page 228.
◆ ORACLE_HOME cannot reside on disk which will be used for snapshot.
Usage Notes
◆ The snapplan must be created on the primary host.
◆ After creating the snapplan using the dbed_vmchecksnap command, you can use a text
editor to review and update the file, if necessary.
◆ It is recommended that you create a local working directory to store your snapplans in.
◆ See the dbed_vmchecksnap(1M) online manual page for more information.
◆ If the SNAPSHOT_MODE for the database is set to online, the primary and secondary hosts can be
the same. If the
SNAPSHOT_MODE is set to offline or instant, the primary and secondary
hosts must be different.