Veritas Storage Foundation™ for Oracle 5.0.1 Administrator's Guide

Note: The Oracle backup and restore utility cannot be used to back up and restore
Quick I/O files.
Some back up software may not be able to back up and restore VxFS extent
attributes. See the qio_recreate(1M) online manual page for information on how
to restore missing Quick I/O files.
About using Veritas NetBackup to backup and restore
Oracle Disk Manager files
Oracle allocates Oracle Disk Manager files with contiguous extent layouts for
good database performance. When you back up your database using Veritas
NetBackup, extent attributes are backed up automatically. When you restore
database files they are allocated using these extent attributes. If you are using
Oracle RMAN's conventional backup method with any backup software, datafiles
are also restored with the proper extent layouts.
If you are not using NetBackup or you are using RMAN's “proxy copy” backup
method with a backup software other than NetBackup, the extent attributes may
not be backed up. To ensure the restored datafiles have proper extent layouts,
preallocate the lost datafiles using the odmmkfile command. This command
preallocates contiguous space for files prior to restoring them.
See the odmmkfile(1M) manual page.
For example, to preallocate an Oracle datafile with size 100 M, assuming the Oracle
database block size is 8K, use the odmmkfile command and enter:
$ /opt/VRTS/bin/odmmkfile -h 8k -s 100m filename
297Using Veritas NetBackup for database backup
About using Veritas NetBackup to backup and restore Oracle Disk Manager files