[ClusterLabs] Two nodes cluster issue

[Kristián Feldsam]

I personally think that power off node by switched pdu is more safe, or not?

S pozdravem Kristián Feldsam
Tel.: +420 773 303 353, +421 944 137 535
E-mail.: support at feldhost.cz

www.feldhost.cz - FeldHost™ – profesionální hostingové a serverové služby za adekvátní ceny.

FELDSAM s.r.o.
V rohu 434/3
Praha 4 – Libuš, PSČ 142 00
IČ: 290 60 958, DIČ: CZ290 60 958
C 200350 vedená u Městského soudu v Praze

Banka: Fio banka a.s.
Číslo účtu: 2400330446/2010
BIC: FIOBCZPPXX
IBAN: CZ82 2010 0000 0024 0033 0446

> On 24 Jul 2017, at 17:27, Klaus Wenninger <kwenning at redhat.com> wrote:
> 
> On 07/24/2017 05:15 PM, Tomer Azran wrote:
>> I still don't understand why the qdevice concept doesn't help on this situation. Since the master node is down, I would expect the quorum to declare it as dead.
>> Why doesn't it happens?
> 
> That is not how quorum works. It just limits the decision-making to the quorate subset of the cluster.
> Still the unknown nodes are not sure to be down.
> That is why I suggested to have quorum-based watchdog-fencing with sbd.
> That would assure that within a certain time all nodes of the non-quorate part
> of the cluster are down.
> 
>> 
>> 
>> 
>> On Mon, Jul 24, 2017 at 4:15 PM +0300, "Dmitri Maziuk" <dmitri.maziuk at gmail.com <mailto:dmitri.maziuk at gmail.com>> wrote:
>> 
>> On 2017-07-24 07:51, Tomer Azran wrote:
>> > We don't have the ability to use it.
>> > Is that the only solution?
>> 
>> No, but I'd recommend thinking about it first. Are you sure you will 
>> care about your cluster working when your server room is on fire? 'Cause 
>> unless you have halon suppression, your server room is a complete 
>> write-off anyway. (Think water from sprinklers hitting rich chunky volts 
>> in the servers.)
>> 
>> Dima
>> 
>> _______________________________________________
>> Users mailing list: Users at clusterlabs.org <mailto:Users at clusterlabs.org>
>> http://lists.clusterlabs.org/mailman/listinfo/users <http://lists.clusterlabs.org/mailman/listinfo/users>
>> 
>> Project Home: http://www.clusterlabs.org <http://www.clusterlabs.org/>
>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf <http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf>
>> Bugs: http://bugs.clusterlabs.org <http://bugs.clusterlabs.org/>
>> 
>> 
>> _______________________________________________
>> Users mailing list: Users at clusterlabs.org <mailto:Users at clusterlabs.org>
>> http://lists.clusterlabs.org/mailman/listinfo/users <http://lists.clusterlabs.org/mailman/listinfo/users>
>> 
>> Project Home: http://www.clusterlabs.org <http://www.clusterlabs.org/>
>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf <http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf>
>> Bugs: http://bugs.clusterlabs.org <http://bugs.clusterlabs.org/>
> 
> -- 
> Klaus Wenninger
> 
> Senior Software Engineer, EMEA ENG Openstack Infrastructure
> 
> Red Hat
> 
> kwenning at redhat.com <mailto:kwenning at redhat.com>   
> _______________________________________________
> Users mailing list: Users at clusterlabs.org <mailto:Users at clusterlabs.org>
> http://lists.clusterlabs.org/mailman/listinfo/users <http://lists.clusterlabs.org/mailman/listinfo/users>
> 
> Project Home: http://www.clusterlabs.org <http://www.clusterlabs.org/>
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf <http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf>
> Bugs: http://bugs.clusterlabs.org <http://bugs.clusterlabs.org/>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.clusterlabs.org/pipermail/users/attachments/20170724/b756e694/attachment-0003.html>