[Linux-HA] drbddisk error

[Dejan Muhamedagic]

Hi,

On Mon, Jun 09, 2008 at 02:34:48PM +0200, Mario Vittorio Guenzi wrote:
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> Dejan Muhamedagic ha scritto:
> > Hi,
> >
> >
> >> You really need stonith. Your test created the split-brain
> >> situation. No way to recover from that in a sane way without
> >> stonith. Worse, you could easily loose data on the shared disk.
> >> Furthermore, you need at least two heartbeat media.
> >
> many thanks Dejan for your promptly reply,
> can you explain better the concept "Furthermore, you need at least two
> heartbeat media"?

Redundant communication paths.

> is the first time tha I setup a cluster and I have copied a lot from
> an old installation in our firm that works whitout stonith devices

A cluster can work without stonith, but in case of split brain
(no communication paths between the nodes) the shared data gets
toasted. There's a log of information about fencing and stonith
at linux-ha.org.

Thanks,

Dejan

> 
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> 
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> 
> - --
> 
> Mario Vittorio Guenzi
> E-mail jclark at tiscali.it
> Si vis pacem, para bellum
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