NFS problems between RHEL4 U3 and RHEL4U6

Fri Jul 18 12:19:03 UTC 2008

No, we never really researched it. We are aware of a spinlock NFS bug
that exists in RHEL4U3 that is fixed in RHEL4U6. This caused some
problems during a benchmark at HP a couple of years ago. I don't know if
this is the same or different problem. But, I do know that serving the
directories from RHELU6 appears to solve our problem, and since we were
planning on upgrading our servers in this office eventually, we'll just
move the upgrade plan up. At the present time, we have another few HDs
on order that should arrive any minute. 

--
Jerry Feldman <Jerry.Feldman at algorithmics.com>
Algorithmics (US), Inc
Suite 2-400
275 Grove St.
Newton, MA 02466
617-663-5220
617-663-5391 (fax) 

> -----Original Message-----
> From: redhat-list-bounces at redhat.com [mailto:redhat-list-
> bounces at redhat.com] On Behalf Of Chet Nichols III
> Sent: Thursday, July 17, 2008 11:52 PM
> To: General Red Hat Linux discussion list
> Subject: Re: NFS problems between RHEL4 U3 and RHEL4U6
> 
> You ever figure this one out?
> Chet
> 
> On Mon, Jul 14, 2008 at 11:57 AM, <jerry.feldman at algorithmics.com>
wrote:
> 
> > RHEL4U3 is running a 2.6.9-34 kernel with nfs utils 1.0.6-65.
> > RHEL4U6 is running 2.6.9-64 kernel with 1.0.6-84.
> >
> > I am also aware that there was a spinlock issue in the Update 3
kernel
> > that affected us on a several hundred system benchmark a couple of
years
> > ago, with a patch that was supposed to be in Update 6. I don't think
the
> > spinlock bug is the issue, but it does look like some type of
locking
> > issue. The reason I don't think we are running into the spinlock
issue
> > is that we are not driving the systems heavily.
> >
> > --
> > Jerry Feldman <Jerry.Feldman at algorithmics.com>
> > Algorithmics (US), Inc
> > Suite 2-400
> > 275 Grove St.
> > Newton, MA 02466
> > 617-663-5220
> > 617-663-5391 (fax)
> >
> >
> > > -----Original Message-----
> > > From: redhat-list-bounces at redhat.com [mailto:redhat-list-
> > > bounces at redhat.com] On Behalf Of chaim.rieger at gmail.com
> > > Sent: Monday, July 14, 2008 11:47 AM
> > > To: General Red Hat Linux discussion list
> > > Subject: Re: NFS problems between RHEL4 U3 and RHEL4U6
> > >
> > > What version of nfs are they running ?
> > > Sent via BlackBerry from T-Mobile
> > >
> > > -----Original Message-----
> > > From: <jerry.feldman at algorithmics.com>
> > >
> > > Date: Mon, 14 Jul 2008 09:57:29
> > > To: <redhat-list at redhat.com>
> > > Subject: NFS problems between RHEL4 U3 and RHEL4U6
> > >
> > >
> > > My primary NFS server is running RHEL4 Update3 (unpatched). I just
> > added
> > > a few servers running U6. (The specific release I run is specified
by
> > > our IT department). The problem I am seeing is:
> > > When I save an 8MB file from our application on a client RHEL4U3
> > machine
> > > the save time is about 1 second. When I perform the same test on a
> > > client running RHEL4U6, the save takes about 2 minutes.
> > >
> > > As a test, I exported a directory from one of the RHELU6 systems,
and
> > > the save times were good on both an update 3 and update 6 client.
So,
> > > one solution is to upgrade U3 to U6. (I would probably do a fresh
> > > install). But, that requires some downtime, and the server room is
not
> > > accessible after hours. (All disks are removable so I probably
could
> > > move the volume group to one of the existing servers to minimize
> > > downtime).
> > >
> > > I would like to know if there is some existing NFS issue between
U3
> > and
> > > U6. If I could provide a temporary fix, that would be a better
interim
> > > solution until the additional drives I ordered arrive.
> > >
> > > --
> > > Jerry Feldman <Jerry.Feldman at algorithmics.com>
> > > Algorithmics (US), Inc
> > > Suite 2-400
> > > 275 Grove St.
> > > Newton, MA 02466
> > > 617-663-5220
> > > 617-663-5391 (fax)
> > >
> > >
> > >
> > >
> > >
> >
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> 
> 
> --
> ----------------------------------------
> chet nichols III
> chet.nichols at gmail.com
> aim: chet / twitter: chet
> http://chetnichols.org
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