Usage: ' vxtunefs [[-D global_option] | [-p] [-s [ -f tunefstab ] [ -o options ]]' [mount point | special ]] ...where option is one of the following: [read_pref_io=value], [read_nstream=value], [write_pref_io=value], [write_nstream=value], [discovered_direct_iosz=value], [max_direct_iosz=value], [qio_cache_enable=value], [odm_cache_enable=value], [write_throttle=value], [max_diskq=value], [initial_extent_size=value], [max_seqio_extent_size=value], [max_buf_data_size=value], [hsm_write_prealloc=value], [read_ahead=value], [inode_aging_size=value], [inode_aging_count=value], [fcl_maxalloc=value], [fcl_keeptime=value], [fcl_winterval=value], [fcl_ointerval=value], [delicache_enable=value], [thin_friendly_alloc=value], [pdir_enable=value], [pdir_threshold=value], [lazy_copyonwrite=value], [shared_pg_enabled=value], [dalloc_enable=value], [dalloc_limit=value], [lazy_isize_enable=value] and global option is list of the following: [print], [ckpt_removable=value] -o and -f options are mutually exclusive -s and -p options are mutually exclusive. The default tunefstab is /etc/vx/tunefstab