Veritas Storage Foundation™ for Oracle 5.0.1 Administrator's Guide

See the odmmkfile(1) manual page.
To preallocate an Oracle datafile with size 100M, assuming the Oracle database
block size is 8K, use the odmmkfile command and enter:
# /opt/VRTS/bin/odmmkfile -h 8k -s 100m filename
About backing up and restoring Quick I/O files using
Legato NetWorker
When Quick I/O files are created using the command qiomkfile, a hidden file
with storage space allocated to it and a link are created. The link points to the
Quick I/O interface of the hidden file. Using qiomkfile ensures that the space for
the file is allocated in a contiguous manner, which typically improves performance.
Legato NetWorker does not follow symbolic links during backups because doing
so would result in the data getting backed up twice: once using the symbolic link
and once as the file itself. As a result, Quick I/O files must be backed up as two
separate files and restored accordingly.
Because Legato NetWorker deletes and recreates files before they are restored,
the restored files lose their contiguous allocation and could be restored as
fragmented files with indirect extents. While this does not impact the integrity
of the data being restored, it can degrade performance. Creating the file using
qiomkfile before doing the backup does not resolve this problem because
NetWorker deletes and recreates the file.
To avoid this potential performance degradation, Quick I/O files must be backed
up and restored using the same methods used to back up and restore raw devices.
This method involves using the NetWorker rawasm command to back up or save
directories containing Quick I/O files. Because of the way the rawasm command
works, NetWorker follows the Quick I/O symbolic link to back up the actual data
in the hidden file. Skip the hidden file to avoid backing up the data twice. During
restore, NetWorker looks at the attributes of the saved file and restores it using
rawasm, bypassing the file deletion and recreation steps.
For example, to view all files in the db01 directory:
$ ls -al /db01
total 2192
drwxr-xr-x 2 root root 96 Oct 20 17:39 .
drwxr-xr-x 9 root root 8192 Oct 20 17:39 ..
395Using third-party software to back up files
About backing up and restoring Quick I/O files using Legato NetWorker