Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

Then...If...
the Quick I/O file is not recreated and a
warning message is displayed.
a Quick I/O file is missing and the regular
VxFS file that it is symbolically linked to is
not the original VxFS file
the Quick I/O file is not recreated and a
warning message is displayed.
a Quick I/O file is smaller than the size listed
in the mkqio.dat file
Disabling Quick I/O
Before disabling Quick I/O, verify the following condition is met:
The file system you plan to remount must be located in the
/etc/fstab file.
Prerequisite
To disable Quick I/O
1
If the database is running, shut it down.
2
To change Quick I/O files back to regular VxFS files, run the following
command from the directory containing the mkqio.dat list:
$ /opt/VRTSsybed/bin/qio_convertdbfiles -u
The list of Quick I/O files in the mkqio.dat file is displayed. For example:
.file1::cdev:vxfs: --> file1
.file2::cdev:vxfs: --> file2
.file3::cdev:vxfs: --> file3
.file4::cdev:vxfs: --> file4
.file5::cdev:vxfs: --> file5
The qio_convertdbfiles command with the undo option (-u) renames the
files from .filename to filename and removes the symbolic link to .filename
that was created along with the Quick I/O files.
3
To remount the file system with Quick I/O disabled, use the mount -o noqio
command as follows:
# /opt/VRTS/bin/mount -F vxfs -o remount,noqio /mount_point
75Improving Sybase performance with Veritas Quick I/O
Disabling Quick I/O