[ClusterLabs] Antw: Re: When the DC crmd is frozen, cluster decisions are delayed infinitely

[Shermal Fernando]

Hi Jehan-Guillaume,

Does this means watchdog will serf-terminate the machine when the crm daemon is frozen?

Regards,
Shermal Fernando








-----Original Message-----
From: Jehan-Guillaume de Rorthais [mailto:jgdr at dalibo.com] 
Sent: Thursday, September 08, 2016 12:52 PM
To: Digimer
Cc: Cluster Labs - All topics related to open-source clustering welcomed
Subject: Re: [ClusterLabs] Antw: Re: When the DC crmd is frozen, cluster decisions are delayed infinitely

On Thu, 8 Sep 2016 15:55:50 +0900
Digimer <lists at alteeve.ca> wrote:

> On 08/09/16 03:47 PM, Ulrich Windl wrote:
> >>>> Shermal Fernando <shermalfe at millenniumit.com> schrieb am 
> >>>> 08.09.2016 um
> >>>> 06:41 in
> > Nachricht
> > <8CE6E8D87F896546B9C65ED80D30A4336578CB4A at LG-SPMB-MBX02.lseg.stockex.local>:
> >> The whole cluster will fail if the DC (crm daemon) is frozen due to 
> >> CPU starvation or hanging while trying to perform a IO operation.
> >> Please share some thoughts on this issue.
> > 
> > What is "the whole cluster will fail"? If the DC times out, some 
> > recovery will take place.
> 
> Yup. The starved node should be declared lost by corosync, the 
> remaining nodes reform and if they're still quorate, the hung node 
> should be fenced. Recovery occur and life goes on.

+1

And fencing might either come from outside, or just from the server itself using watchdog.

--
Jehan-Guillaume (ioguix) de Rorthais
Dalibo

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