About file system tunables

Using the /etc/vx/tunefstab file updates the tunable parameters at the time of mounting a file system. The file system /etc/vx/tunefstab parameters are set to be identical on all nodes by propagating the parameters to each cluster node. When the file system is mounted on the node, the /etc/vx/tunefstab parameters of the primary node are used. Symantec recommends that this file be identical on each node.


If the /etc/vx/tunefstab file does not exist, create it manually.

To tune the lazy_copyonwrite to 1 while mounting a device, you configure the file. For example:

# cat /etc/vx/tunefstab

/dev/vx/dsk/sharedg/vol1 lazy_copyonwrite=1

See the tunefstab(4) and vxtunefs(1M) manual pages for more information.