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

[Klaus Wenninger]

On 09/08/2016 10:58 AM, Shermal Fernando wrote:
> Hi Jehan-Guillaume,
>
> Does this means watchdog will serf-terminate the machine when the crm daemon is frozen?

Would be desirable but doesn't seem to happen - at least till now - will
see what I can do on that front.
 
>
> Regards,
> Shermal Fernando
>
>
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> -----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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