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

nfs performance tuning for hp-ux 11.0 and 11i systems page 105

Notes:

Page 105July 22, 2002

How can you verify which NFS

mount options are being used?

nfs mount

options

The easiest and most accurate way to determine which NFS mount options are in

effect on a per-mountpoint basis is to use the “nfsstat -m” command.

Looking at the above screenshot, we can determine several things about the way

this client has mounted its filesystems. For example, three of the four filesystems are

mounted using NFS PV3 – only /nfs_mount4 is using PV2. Also, all filesystems

but /nfs_mount4 are mounted from NFS server “emonster”. We can see that

/nfs_mount3 is mounted with the “noac” option and is using read and write

buffer sizes of 32KB. We see that /nfs_mount2 is using a read size of 1KB and

a write size of 4KB. Also, notice that 3 of the 4 filesystems use UDP as their

underlying transport, only /nfs_mount4 uses TCP. Finally, we see that

/nfs_mount1 and /nfs_mount3 reference the same remote filesystem from the

same NFS server, but they are mounted on the client with different options.

Notice that the “nfsstat –m” output also includes the smooth round trip timers

maintained for the various NFS call types (Lookups, Reads, Writes) on NFS/UDP

mounts. This information can be very useful, especially when trying to determine

why one NFS mounted filesystem is performing better or worse than another.