[Lustre-discuss] MDS overload, why?

[Arne Brutschy]

Hi,

ok, thanks then. I was hoping there's something like "doing this or that
operation in abundance will cause this sort of behavior". :)

Well then, I will add a serial console and the lustre monitoring. I will
then try to send the MDS into overload, as we have by now managed to
isolate the user who is apparently causing the overload.

Thanks for now and have a nice weekend
Arne


On Fr, 2009-10-09 at 10:23 -0400, Brian J. Murrell wrote:
> On Fri, 2009-10-09 at 16:15 +0200, Arne Brutschy wrote:
> > Hi,
> 
> Hi,
> 
> > thanks for replying!
> 
> NP.
> 
> > I understand that without further information we can't do much about the
> > oopses.
> 
> Not just the oopses.  It's pretty hard to diagnose any problem without
> data.
> 
> > I was more hoping for some information regarding possible
> > sources of such an overload.
> 
> The possibilities are endless.  Lustre is a complex system with many,
> many interactions with many other components.  Sure, I could make stab
> in the dark guesses like too little memory, too slow disk, etc., but
> none of those are actually useful for anything more than a shopping trip
> and even then new hardware might still not solve your problem.
> 
> > How can I find the source of the problem?
> 
> Examine the logs.  Lustre logs a lot of information when things are
> going wrong.
> 
> b.
> 
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-- 
Arne Brutschy
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