[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: [Linux-cluster] Gfs2 Problem



Hi,

On Mon, 2010-09-27 at 17:30 +0200, Marcello Percoco - Diennea wrote:
> Hallo.
> 
> 
> We have a 3 node cluster, with a shared Gfs2 used by our application.
> 
> Evry day all the 3 machines get stuck, in the dmesg i see many “task
> hang…” with a stack trace referign to dlm and Gfs2 (i didin’t have a
> trace to post now, but next time i add it to the mail).
> 
That would be helpful in tracking down the cause. Also a lock dump would
be useful too (you need debugfs mounted somewhere).

>  
> 
> The application write and delete many lock file, but every lock file
> had is own directory.
> 
So it is unlikely to be directory lock contention then, it seems.

> Whath could be the problem?
> 
>  
There are a lot of possible causes. Without the traces it is very tricky
to narrow it down. I think you are looking in the right area though.

> 
> Our Gfs2 had 512Mb journals, is this a good idea or not?
> 
That sounds like a lot. It won't hurt though and I very much doubt that
is related to the hangs.

The key is to figure out whether the problem is actually a hang or
whether it is just being slow. If you can get two lock dumps from a node
that is having problems, say a minute or two apart, that should tell you
that vital information,

Steve.

>  
> 
> Thnx.
> 
>  
> 
> -- 
> 
> Marcello Percoco
> IT Junior
> 
> 
> 
> Diennea
> Viale G. Marconi, 30/14
> 48018 Faenza (RA) - Italy
> 
> E-Mail: marcello percoco diennea com
> Tel.: (+39) 0546 667432 - Int. 916
> Fax:  (+39) 0546 399913
> 
> 
> 
> MagNews - E-Mail Marketing Solutions
> http://www.magnews.it
> 
> Diennea - Technology for Marketing
> http://www.diennea.com 
> 
> 
> 
> DISCLAIMER
> Questo messaggio e i suoi allegati si rivolgono esclusivamente ai
> destinatari e possono contenere informazioni personali, confidenziali
> o protette da diritti. Se ha ricevuto questo messaggio per errore,
> l'utilizzo dei suoi contenuti è proibito e può esporre a conseguenze
> penali o civili. La invitiamo pertanto a rispedire immediatamente il
> messaggio al mittente e cancellarne gli allegati senza conservarne una
> copia. Per ulteriori informazioni, La preghiamo di contattarci
> all'indirizzo postmaster diennea com  Grazie 
> This e-mail and any attachments may be confidential and the subject of
> legal professional privilege. Any disclosure, use, storage or copying
> of this e-mail without the consent of the sender is strictly
> prohibited. Please notify the sender immediately if you are not the
> intended recipient and then delete the e-mail from your inbox and do
> not disclose the contents to another person, use, copy or store the
> information in any medium. For further information write to
> postmaster diennea com  Thanks
> 
>  
> 
> 
> --
> Linux-cluster mailing list
> Linux-cluster redhat com
> https://www.redhat.com/mailman/listinfo/linux-cluster



[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]