Veritas File System 5.1 SP1 Administrator"s Guide (5900-1499, April 2011)

The default value of vx_ifree_timelag is 0. By setting vx_ifree_timelag to 0,
the inode free time lag is autotuned to 600 seconds. Specifying negative one (-1)
stops the freeing of inode space; no further inode allocations are freed until the
value is changed back to a value other than negative one.
You can change the value of vx_ifree_timelag using the sam or kctune commands.
See the sam(1M) and kctune(1M) manual pages.
You can also add an entry to the system configuration file. The following example
changes the value of vx_ifree_timelag to 2400 seconds:
# kctune -s vxfs_ifree_timelag=2400
Note: The default value of vx_ifree_timelag typically provides optimal VxFS
performance. Be careful when adjusting the tunable because incorrect tuning can
adversely affect system performance.
Partitioned directories
You can enable or disable the partitioned directories feature by setting the
pdir_enable tunable. Specifying a value of 1 enables partitioned directories, while
specifying a value of 0 disables partitioned directories. The default value is 0.
You can set the pdir_threshold tunable to specify the threshold value in terms
of directory size in bytes beyond which VxFS will partition a directory if you
enabled partitioned directories. The default value is 32000.
The -d option of the fsadm command removes empty hidden directories from
partitioned directories. If you disabled partitioned directories, the fsadm -d
command also converts partitioned directories to regular directories.
The partitioned directories feature operates only on disk layout Version 8 or later
file systems.
Monitoring free space
In general, VxFS works best if the percentage of free space in the file system does
not get below 10 percent. This is because file systems with 10 percent or more
free space have less fragmentation and better extent allocation. Regular use of
the df command to monitor free space is desirable.
See the df_vxfs(1M) manual page.
Full file systems may have an adverse effect on file system performance. Full file
systems should therefore have some files removed, or should be expanded.
49VxFS performance: creating, mounting, and tuning file systems
Monitoring free space