From: Olaf Kirch <okir@suse.de>
Subject: Re: Linux NFS writes to Solaris very, very slow
Date: Fri, 23 Jul 2004 18:35:32 +0200
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <20040723163532.GA14157@suse.de>
References: <200407231620.i6NGKYV20945@algebra.hillsboro.credence.com>
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Cc: nfs@lists.sourceforge.net
To: John Roberts <john_roberts@credence.com>
In-Reply-To: <200407231620.i6NGKYV20945@algebra.hillsboro.credence.com>
Errors-To: nfs-admin@lists.sourceforge.net

On Fri, Jul 23, 2004 at 09:20:34AM -0700, John Roberts wrote:
> What we've observed is that NFS writes from our Linux boxes to
> the Solaris server (and other Solaris workstations) is _very_
> slow.  Reads seem to be operating at a reasonable speed.
> FTP speeds are blazing (protocol below NFS).

What are your mount options? you should be using nfsv3; v2 is
of course terribly slow on writes.

> On a completely seperate note, Linux-to-Linux NFS file writes
> only seem to be fast if we publish the serving Linux volume
> as asynchronous (default setting is synchronous which is slow).

as long as your client uses nfsv2, that is to be expected. In
NFSv2 the (mandated) default is to use sync mode, i.e. write
each and every blob of data to disk before acknowledging the
RPC operation.

Olaf
-- 
Olaf Kirch     |  The Hardware Gods hate me.
okir@suse.de   |
---------------+ 


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