VERITAS File System 4.1 Administrator's Guide

Quick I/O for Databases
Cached Quick I/O For Databases
Chapter 11 175
names.dbf,OFF
To check the setting of the qio_cache_enable flag for a file system, enter:
$ vxtunefs -p /database01
qio_cache_enable = 1
For more information on the format of the /etc/vx/qioadmin file and the command syntax,
see the qioadmin(1) manual page.
NOTE Check the setting of the flag qio_cache_enable using the vxtunefs command,
and the individual cache advisories for each file, to verify caching.
Tuning Cached Quick I/O
Not all database files can take advantage of caching. Performance may even degrade in some
instances (due to double buffering, for example). Determining which files and applications can
benefit from Cached Quick I/O requires that you first collect and analyze the caching
statistics.
See the qiostat(1) manpage for information on gathering statistics, and the VERITAS
Editions products documentation for a description of the Cached Quick I/O tuning
methodology.