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

Making individual file settings for Cached Quick I/O persistent

You can make the enable or disable individual file settings for Cached Quick I/O

persistent across reboots and mounts by adding cache advisory entries in the

/etc/vx/qioadmin file.

Cache advisories set using the qioadmin command are stored as extended attributes

of the file in the inode. These settings persist across file system remounts and

system reboots, but these attributes are not backed up by the usual backup

methods, so they cannot be restored. Therefore, always be sure to reset cache

advisories after each file restore. This is not necessary if you maintain the cache

advisories for Quick I/O files in the /etc/vx/qioadmin file.

To enable or disable individual file settings for Cached Quick I/O automatically

after a reboot or mount

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Add cache advisory entries in the /etc/vx/qioadmin file as follows:

device=/dev/vx/dsk/<diskgroup>/<volume>

filename,OFF

filename,ON

For example, to make the Cached Quick I/O settings for individual files in the

/db01 file system persistent, edit the /etc/vx/qioadmin file similar to the

following:

# List of files to cache in /db01 file system

device=/dev/vx/dsk/PRODdg/db01

dbfile01,OFF

dbfile02,OFF

dbfile03,ON

Determining individual file settings for Cached Quick I/O using

qioadmin

You can determine whether Cached Quick I/O is enabled or disabled for individual

files by displaying the file's cache advisory setting using the qioadmin command.

Improving DB2 database performance with Veritas Cached Quick I/O

Enabling and disabling Cached Quick I/O for individual files