On 23 May 2001, Mark Delany wrote:
> I don't want to start an OS war, but if you want to use NFS on an
> Intel box, I strongly suggest one of the BSDs. I was in a situation
> where I had to use Linux NFS servers - that was until they failed
> miserabled. They were replaced with FreeBSD and the problems went
> away.
Also, check how your OS supports turning UDP checksumming off, and make
sure it's off. It's of no great help on a local switched segment and
affects NFS performance. Are you using traditional NFS or TCP-based NFS?
If performance is the real desired goal, UDP-based NFS is going to be a
lot faster, if not as secure. But, hey, once you're in NFS-land, you're
going to want to keep it all on a tight, local segment if security's even
vaguely your issue.
Finally, you may want to put the server on a gig connection into the
switch, and the client servers on the same switch on 100Mbit FDX.
-M
> Regards.
>
>
> On Wed, May 23, 2001 at 01:40:13PM -0500, Duane Schaub allegedly wrote:
> >
> > I want to set up multiple qmail machines to access an NFS backend. We have
> > about 10,000 users (running maildir) and an average of 5 emails/user/dat and
> > av. 10K in size. On average, there are 6 simultaneous pop sessions with
> > approx. 200 new sessions/min.
> >
> > We have tried a Redhat6.1 backend on the NFS with Redhat 6.1 NFS clients.
> > The result was that the qmail machines were BARELY able to keep up. If
> > there were any pauses on the NFS server, the POP sessions would build to
> > 50-60 very quickly with qmail crashing at about 300 sessions. Once qmail
> > exceeded about 70 sessions, it was beyond the point of return and would not
> > recover.
> >
> > The NFS server was nothing special (P350/IDE 256Mb RAM). We also tried a
> > Dell 2300 (Dual 400/RAID5) NT server running Intergraph NFS.... But the
> > performance was abysmal! Performing an ls in a user/new directory took 21
> > seconds for a response.
> >
> > I think NFS would work, but I don't really want a Netapp F5 ($50,000). What
> > NFS experiences are out there?
> >
> > If you wish - respond privately [EMAIL PROTECTED]
> >
> > Duane.
> >
Michael Brian Scher [EMAIL PROTECTED] [EMAIL PROTECTED]
Sr. Research Consultant
Attorney, Anthropologist, Part-Time Guru
Mailaise: n, ('mail-aze). See Outlook.
