Disable NFS client cache (or other traffic reduction methods)

[Charles Swiger]

On Apr 7, 2005, at 3:51 PM, Eli Dart wrote:
> Looking at the packet contents, it appears to be fetching back the
> last few blocks of the log file.
>
> My guess is that this is the client keeping its NFS cache fresh.
> The client is never, ever, ever going to read that file (or any file
> on that filesystem) other than the bare minimum required to open it
> for writing and rotate the log files.
>
> Is there a way to disable client-side caching?  I've looked, and
> can't seem to find one.  Or, do I have this wrong and there is
> something else that is causing this?

Take a look through "man mount_nfs" for:

      -a      Set the read-ahead count to the specified value.  This may 
be in
              the range of 0 - 4, and determines how many blocks will be 
read
              ahead when a large file is being read sequentially.  
Trying a
              value greater than 1 for this is suggested for mounts with 
a
              large bandwidth * delay product.

...and the -o ac*** options.  Although you may be right-- I was a bit 
surprised not to see a "-o noac", myself.  Solaris has one:

            noac  Suppress data and attribute caching.

:-)

-- 
-Chuck