Veritas™ File System 5.0.1 Administrator's Guide

The “after” result is an indication of how well the reorganizer has performed. The

degree of fragmentation should be close to the characteristics of an unfragmented

file system. If not, it may be a good idea to resize the file system; full file systems

tend to fragment and are difficult to defragment. It is also possible that the

reorganization is not being performed at a time during which the file system in

question is relatively idle.

Directory reorganization is not nearly as critical as extent reorganization, but

regular directory reorganization improves performance. It is advisable to schedule

directory reorganization for file systems when the extent reorganization is

scheduled. The following is a sample script that is run periodically at 3:00 A.M.

from cron for a number of file systems:

outfile=/usr/spool/fsadm/out.‘/bin/date +'%m%d'‘

for i in /home /home2 /project /db

/bin/echo "Reorganizing $i"

/bin/timex fsadm -F vxfs -e -E -s $i

/bin/timex fsadm -F vxfs -s -d -D $i

done > $outfile 2>&1

Thin Reclamation

Veritas File System (VxFS) supports reclamation of free storage on a Thin Storage

LUN. Free storage is reclaimed using the fsadm command or the vxfs_ts_reclaim

API. You can perform the default reclamation or aggressive reclamation. If you

used a file system for a long time and must perform reclamation on the file system,

Symantec recommends that you run aggressive reclamation. Aggressive

reclamation compacts the allocated blocks, which creates larger free blocks that

can potentially be reclaimed.

See the fsadm_vxfs(1M) and vxfs_ts_reclaim(3) manual pages.

Thin Reclamation is only supported on file systems mounted on a VxVM volume.

The following example performs reclamation of free storage to the Thin Storage

LUN on a VxFS file system mounted at /mnt1:

# fsadm -R /mnt1

Veritas File System also supports reclamation of a portion of the file system using

the vxfs_ts_reclaim() API.

See the Veritas File System Programmer's Reference Guide.

VxFS performance: creating, mounting, and tuning file systems

Monitoring free space