Re: SATA problems

[Pablo Sebastian Greco <lkml@fliagreco.com.ar>]

Pablo Sebastian Greco wrote:
> Tejun Heo wrote:
> > Pablo Sebastian Greco wrote:
> >  
> > > By crash I mean the whole system going down, having to reset the entire
> > > machine.
> > > I'm sending you 4 files:
> > > dmesg: current boot dmesg, just a boot, because no errors appeared 
> > > after
> > > last crash, since the server is out of production right now (errors
> > > usually appear under heavy load, and this primarily a transparent proxy
> > > for about 1000 simultaneous users)
> > > lspci: the way you asked for it
> > > messages and messages.1: files where you can see old boots and crashes
> > > (even a soft lockup).
> > > If there is anything else I can do, let me know. If you need direct
> > > access to the server, I can arrange that too.
> > >     
> >
> > Can you try 2.6.20-rc3 and see if 'CLO not available' message goes away
> > (please post boot dmesg)?
> >
> > The crash/lock is because filesystem code does not cope with IO errors
> > very well.  I can't tell why timeouts are occurring in the first place.
> >  It seems that only samsung drives are affected (sda2, 3, 4).  Hmmm...
> > Please apply the attached patch to 2.6.20-rc3 and test it.
> >
> > Thanks.
> >
> >   
> Here's boot dmesg with 2.6.20-rc3 + blacklist. And you are right about 
> only affecting samsung drives, but since only those drives get all the 
> heavy load, couldn't tell exactly.
> I'm putting the server in production right now, so I think in a few 
> hours I'll have more info.
>
> Thanks.
> Pablo.
After an uptime of  13:34 under heavy load and no errors, I'm pretty 
sure your patch is correct. Is there a way to backport this to 2.6.18.x?
Just an off topic question, does anyone know why I get so uneven IRQ 
handling on 2.6.19-20 and almost perfect on 2.6.20-rc2-mm1?

Thanks for everything.
Pablo.
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