Date: Wed, 20 Mar 2002 08:27:46 +0100
From: Martin Apel <apel@hs.tecmath.de>
To: Steve Lord <lord@sgi.com>
cc: "ZINKEVICIUS,MATT   (HP-Loveland,ex1)" <matt_zinkevicius@hp.com>,
   <samba-technical@lists.samba.org>, <linux-xfs@oss.sgi.com>
Subject: Re: TDB corruption with Samba 2.2.3a
In-Reply-To: <1016567299.1770.128.camel@jen.americas.sgi.com>
Message-ID: <Pine.SGI.4.40.0203200813140.4717633-100000@tmsgi7.humanmodeling.tecmath.de>
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On 19 Mar 2002, Steve Lord wrote:

> On Tue, 2002-03-19 at 01:03, Martin Apel wrote:
> > On Wed, 13 Mar 2002, Jeremy Allison wrote:
> >
> > > On Wed, Mar 13, 2002 at 05:25:13AM -0500, ZINKEVICIUS,MATT (HP-Loveland,ex1) wrote:
> > > > We are also experiencing the TDB corruptions, as reported in the samba log
> > > > files. At first there didn't seem to be an consequence, but we are now
> > > > beginning to see user's not being able to login to the machine. As a
> > > > workaround we have been just deleting the secrets.tdb file, restarting
> > > > samba, and rejoining the domain.
> > > >
> > > > Our server if very similar to Martin's (Samba 2.2.3a + Linux 2.4.17 + XFS).
> > > > I'll post more details soon.
> > >
> > > Can you try using the tdbbackup utility periodically
> > > to determine when the corruption may be occurring ?
> >
> > I let the tdbbackup run for a few days now. The TDB corruption seems to
> > happen at the time, when Amanda (a great backup tool) starts to run.
> > I have moved the Amanda start time back and forth and the corruption
> > starts within 10 minutes after starting Amanda.
> > I don't think it's Amanda's fault, I assume that Amanda puts a heavy load
> > on the filesystem layer during the first minutes, when it does its estimates.
> > A reminder: all partitions on this system are XFS partititions, including
> > /var, where Samba stores the TDB files.
> > I could try to reformat the /var filesystem with ext2 to see if this has
> > any influence. But this will probably need a server reboot, so I cannot
> > do this before the weekend.
> >
> > Martin
>
> Can you try a kernel from the 2.4 xfs cvs tree - I just pushed some
> changes out there which fix a corruption problem under heavy memory
> pressure.

Hi Steve,

since this is our production server with 50 people being dependent on it
I would rather not try the current CVS version. Is it possible to isolate
your patch relative to XFS 1.0.2?
For the record: I put the Samba lock directory onto an ext2 partition
yesterday and had no problems since then.

Martin
________________________________________________________________________
Martin Apel, Dipl.-Inform.                            t e c m a t h  A G
Group Manager Software Development              Human Solutions Division
phone +49 (0)631 303-5600           Europaallee 10, 67657 Kaiserslautern
fax   +49 (0)631 303-5700                                        Germany
apel@hs.tecmath.com                               http://www.tecmath.com
________________________________________________________________________