SUMMARY: NFS mount options

From: Dirk Moolman <>
Date: Thu Apr 21 2005 - 08:35:04 EDT
Wow, I received so many replies on this one.

First of all, I made a mistake, and added the noac option to the server
instead of the client. So the "noac" option is available, I just used it
on the wrong server.
Thanks to:  Pablo Jejcic, Dave Mitchell, Tim Chipman, Mike Demarco,
Martin Wheatley, Bernd Schemmer, Brandon Haberfeld

Second mistake, I found articles on the web saying that noac will
improve my NFS performance, which I am told now is not true.  Disabling
the attribute caching will actually make my performance worse instead of
improving it.
Thanks to: Ben Garrett, Tim Chipman, Martin Wheatley, Brandon Haberfeld

I will have to do some more digging, to find out what exactly is causing
my NFS mounts to be slow.

Thank you very much for all the feedback


I am hoping that you can shed some light on this for me.   I am
experiencing bad NFS performance.   I do not have much experience with
this. My support engineers told me to set the "noac" option in the
/etc/vfstab file, to improve my NFS performance (after they also did
some searching on the web).

I tried Google, I tried the sysadmin guides, and cannot find examples of
how this is done.   I tried it myself by just putting in in the vfstab
file, but received an error doing this.

Is this option supported in Solaris 9 ?

The line in /etc/vfstab (after I changed it):

/dev/vx/dsk/testdg/intest /dev/vx/rdsk/testdg/intest /intest ufs - yes

The error I received:

mount /intest
mount: /dev/vx/dsk/testdg/intest on /intest - WARNING unknown options

Any help will be appreciated

Dirk Moolman
Database and Unix Administrator
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Received on Thu Apr 21 08:35:04 2005

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