Date: Thu, 7 Apr 2005 16:09:58 -0400 From: Charles Swiger <cswiger@mac.com> To: dart@nersc.gov Cc: freebsd-net@freebsd.org Subject: Re: Disable NFS client cache (or other traffic reduction methods) Message-ID: <ed3e994e8a85a7461c15771b776c916d@mac.com> In-Reply-To: <42558F33.5090109@nersc.gov> References: <42558F33.5090109@nersc.gov>
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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
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