[Linux-cluster] totem token & post_fail_delay question

[emmanuel segura]

i think, you are talking about:

 Post-join delay is the number of seconds the daemon will wait before
fencing any victims after a node joins the domain.



2014-08-26 10:23 GMT+02:00 Christine Caulfield <ccaulfie at redhat.com>:
> On 26/08/14 07:56, Vasil Valchev wrote:
>>
>> Hello,
>>
>> I have a cluster that sometimes has intermittent network issues on the
>> heartbeat network.
>> Unfortunately improving the network is not an option, so I am looking
>> for a way to tolerate longer interruptions.
>>
>> Previously it seemed to me the post_fail_delay option is suitable, but
>> after some research it might not be what I am looking for.
>>
>> If I am correct, when a member leaves (due to token timeout) the cluster
>> will wait the post_fail_delay before fencing. If the member rejoins
>> before that, it will still be fenced, because it has previous state?
>>  From a recent fencing on this cluster there is a strange message:
>>
>> Aug 24 06:20:45 node2 openais[29048]: [MAIN ] Not killing node node1cl
>> despite it rejoining the cluster with existing state, it has a lower node
>> ID
>>
>> What does this mean?
>>
>
> It's an attempt by cman to sort out which node to kill in the situation
> where a node rejoins too quickly. If both nodes try to send a 'kill' message
> then then both nodes would leave the cluster leaving you with no active
> nodes. So cman (and fencing) prioritise the node with the lowest nodeID in
> an attempt at a tie-break. you should see a corresponding message on the
> other node:
> "Killing node %s because it has rejoined the cluster with existing state and
> has higher node ID"
>
>
>
>> And lastly is increasing the totem token timeout the way to go?
>>
>
> if there is no option for improving the network situation then, yes,
> increasing token timeout is probably your best option.
>
> Chrissie
>
>
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