VERITAS Storage Foundation 4.1 Oracle Administrator's Guide

Preallocating Space for Quick I/O Files Using the setext Command Prerelease 8 September 2005, 8:54am
90 VERITAS Storage Foundation for Oracle Administrator’s Guide
Preallocating Space for Quick I/O Files Using the setext
Command
As an alternative to using the qiomkfile command, you can also use the VxFS setext
command to preallocate space for database files.
Prerequisites
◆ The setext command requires superuser (root) privileges.
Usage Notes
◆ You need to use the chown and chgrp commands to change the owner and group
permissions on the file after you create it.
◆ See the setext(1M) manual page for more information.
▼ To create a Quick I/O database file using setext
1. Access the VxFS mount point and create a file:
# cd /mount_point
# touch .filename
2. Use the setext command to preallocate space for the file:
# /opt/VRTS/bin/setext -r size -f noreserve -f chgsize \
.filename
3. Create a symbolic link to allow databases or applications access to the file using its Quick I/O
interface:
# ln -s .filename::cdev:vxfs: filename
4. Change the owner and group permissions on the file:
# chown oracle .filename
# chgrp dba .filename
# chmod 660 .filename