Several VxVM parameters can be tuned using the System Management Interface Tool (SMIT). Some VxVM parameters can be tuned only using the vxtune command.
To change the values of the tunables
Tunables with values in bytes.
Position your cursor in the entry field, enter a new value (in bytes), and then press Return to initiate the change.
Tunables with options, such as Transport used for VVR and Replication over NAT based Firewall.
Position your cursor in the entry field. Press the Tab key until the desired value appears.