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Re: "serious issues with the 2.6 NFS server" (was: Re: Mail clustering)



Am 2007-03-20 17:53:33, schrieb Michael Loftis:
> --On March 21, 2007 12:26:45 AM +0100 Maximilian Wilhelm <max@rfc2324.org> 
> >Could you tell me/us about the serious problems with NFS server on
> >linux 2.6?
> 
> Basically under high load the NFS server would very randomly start telling 
> the clients permission denied on inodes.  This was tested with debian stock 
> 2.6.8 and kernel.org kernels 2.6.8, .9, and IIRC also .10.  I was never 
> able to adequately pin down exactly what was causing it, nor get it into a 
> reliably reproducible state in a lab setup so I had to give up digging at 
> it.
> 
> It was fine under low transaction rates, but once the rates started to pick 
> up it was like there was a locking issue or a contention issue going on 
> where the nfs kerneld would return errors randomly to the clients on 
> directories they clearly had access to.
> 
> For a lot of people it may be fine, but under high load it fell apart.  No 
> real idea why which was the dismaying part.  No OOPSes or any other 
> misbehavior, just random nfs calls denied.

I am running now on all Mailservers Etch but with selfcooked 2.4.33
and I can confirm, that Linux 2.6 has definitivly a NFS problem.

I use 5 NFS-Servers with currently 17.000 users in summary and over
200 million messages.

I have never had any problems with Hardware even by using Raid-5
with ICP-Vortex Controlers but Linux 2.6.  I have tried to use
2.6.16, 2.6.18 and 2.6.20 without luck.

Thanks, Greetings and nice Day
    Michelle Konzack
    Systemadministrator
    Tamay Dogan Network
    Debian GNU/Linux Consultant


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