Making Cached Quick I/O settings persistent across reboots and mounts<a class="indexterm" name="id420298"></a>


Making Cached Quick I/O settings persistent across reboots and mounts
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Making Cached Quick I/O settings persistent across reboots and mounts

You can make the Cached Quick I/O system setting persistent across reboots and mounts by adding a file system entry in the /etc/vx/tunefstab file.

Note:

The tunefstab file is a user-created file. For information on how to create the file and add tuning parameters, see the tunefstab (4) manual page.

To enable a file system after rebooting

Put the file system in the /etc/vx/tunefstab file and set the flag entry:
```
    /dev/vx/dsk/dgname/volname qio_cache_enable=1
```
where:
- /dev/vx/dsk/dgname/volname is the name of a block device
- dgname is the name of the disk group
- volname is the name of the volume
For example:
```
    /dev/vx/dsk/PRODdg/db01 qio_cache_enable=1
    /dev/vx/dsk/PRODdg/db02 qio_cache_enable=1
```
where /dev/vx/dsk/PRODdg/db01 is the block device on which the file system resides.

The tunefstab (4) manual pages contain information on how to add tuning parameters.

See the tunefstab (4) manual page.

Note:

vxtunefs can specify a mount point or a block device; tunefstab must always specify a block device only.

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