NFS Performance Tuning for HP-UX 11.0 and 11i Systems

nfs performance tuning for hp-ux 11.0 and 11i systems page 19

Notes:

Page 19July 22, 2002

local

filesystems

Filesystem Recommendations (part 2)

• Mount filesystems with “–o delaylog” if possible

• Monitor fragmentation via the fsadm –D –E command

• De-fragment filesystems via the fsadm –d –e command

• Monitor filesystem utilization via the bdf(1M) command

Ø don’t let critical filesystems get below 10% free space

• Enable immediate disk reporting via scsictl(1M)

The “–o delaylog” mount option should be specified if your environment allows it.

In delaylog mode, some system calls return before the intent log is written. This

improves the performance of the system, but some changes are not guaranteed

until a short time later when the intent log is written.

VxFS filesystems can get fragmented with heavy usage over time. Performance can

be severely impacted on very fragmented volumes. It is therefore important to

monitor the fragmentation level of your critical exported filesystems and periodically

de-fragment them via the fsadm(1M) command.

It is also important to monitor the utilization of critical filesystems. Care should be

taken to ensure that these filesystem resources are not exhausted.

For those SCSI devices where immediate disk reporting is available (such as the

SC10 disks in an FC-60 array), use the scsictl(1M) command to enable this feature.