[ClusterLabs] Fencing on 2-node cluster
lists at alteeve.ca
Wed Jun 20 17:55:57 EDT 2018
Fencing is required on all clusters, and specially on 2-node ones.
On 2018-06-20 05:53 PM, Casey & Gina wrote:
> Does this mean that fencing can't actually work in a 2-node cluster?? Or is it just that the delay needs set differently on one of the hosts and it will start working?
>> On 2018-06-20, at 3:50 PM, Digimer <lists at alteeve.ca> wrote:
>> On 2018-06-20 05:46 PM, Jehan-Guillaume de Rorthais wrote:
>>> On Wed, 20 Jun 2018 17:24:41 -0400
>>> Digimer <lists at alteeve.ca> wrote:
>>>> Make sure quorum is disabled. Quorum doesn't work on 2-node clusters.
>>> It does with the "two_node" parameter enabled in corosync.conf...as far as I
>>> understand it anyway...
>> It doesn't, that option disables quorum in corosync.
>> Quorum is floor(($nodes / 2) + 1). So in a 3-node, that is 3 -> 1.5 ->
>> 2.5 -> 2 votes needed for quorum. In a 2-node, that is 2 -> 1 -> 2 -> 2
>> votes needed for quorum, meaning you can't lose a node to operate (which
>> is kinda not HA :) ).
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have lived and died in cotton fields and sweatshops." - Stephen Jay Gould
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