SUMMARY: Accessing NFS directory slows machine down

From: Alan Bradley - CPX WC (AlanB@ComparexAfrica.co.za)
Date: Wed Jan 22 2003 - 02:00:46 EST


Hi,

Thanks to everyone who responded, including Michael Kiernan, Brett Lymn, AP,
etc.

I had a number of suggestions such as:

Option 1 use UDP and NFS Version 2
abcd:/db2/temp/share /db2/temp/share nfs rw,bg,vers=2,proto=udp

Option 2 reduce the write packets size std=32k
abcd:/db2/temp/share /db2/temp/share nfs rw,bg,wsize=8192

Check out all the options in man page
$ man mount_ufs

AND

The best policy in this situation is to try all combinations and
see which works best for your server/network/client So:

proto=tcp,vers=3,rsize=1024,wsize=1024
proto=tcp,vers=3,rsize=32768,wsize=32768
(try also proto=udp if the network path is short and reliable)

maybe also try:
vers=2,rsize=1024,wsize=1024

benchmark with something like:
timex dd if=/dev/zero of=/nfsmnt/out bs=1024k count=1024

In the end, I created a cache-fs which seems to have gone some way towards
helping the situation.

Regards

-----Original Message-----
From: Alan Bradley - CPX WC [mailto:AlanB@comparexafrica.co.za]
Sent: Monday, January 13, 2003 4:12 PM
To: Sun Managers (E-mail)
Subject: Accessing NFS directory slows machine down

Hi All,

I have an NFS file system mounted from one sun server to another one.

The mount line in /etc/mnttab is as follows:

abcd:/db2/temp/share /db2/temp/share nfs rw,bg,dev=4712305 1042098734

I have 2 other read only filesystems that are also mounted from server abcd
that are performing fine.

When I copy data to the one mounted rw, the whole server slows down. Does
anyone have any suggestions or ideas? Do I need to specify particular
parameters when doing the mount?

I will summarise.

Regards,
Alan.
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