Use the vxtune tunable command with the value argument to set the tunable to a new value. You can specify the value in Bytes (B), kilobytes (KB), megabytes (MB), or gigabytes (GB).

After modifying the tunable, the new tunable values are displayed immediately. However for some tunables like NMCOM_POOL_SIZE (vol_max_nmpool_sz), READBACK_POOL_SIZE (vol_max_rdback_sz), BASE_MEMORY (vol_min_lowmem_sz), and MAX_MEMORY (vol_rvio_maxpool_sz) you need to restart the system if you have assigned lower values than the specified one for these tunables. The changed value is in effect after the system has been restarted.

Syntax for vxtune tunable <value> command

vxtune [ <tunable> [<value>] ]