[ClusterLabs] Antw: Re: Antw: Re: questions about startup fencing

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Tue Dec 5 08:45:28 EST 2017

>>> Klaus Wenninger <kwenning at redhat.com> schrieb am 04.12.2017 um 16:20 in
Nachricht <24ed4710-322d-0560-b0ff-792cbf53d6bb at redhat.com>:
> On 12/04/2017 04:02 PM, Kristoffer Grönlund wrote:
>> Tomas Jelinek <tojeline at redhat.com> writes:
>>>> * how is it shutting down the cluster when issuing "pcs cluster stop
>>> First, it sends a request to each node to stop pacemaker. The requests 
>>> are sent in parallel which prevents resources from being moved from node 
>>> to node. Once pacemaker stops on all nodes, corosync is stopped on all 
>>> nodes in the same manner.
>>>> * any race condition possible where the cib will record only one node up

> before
>>>>    the last one shut down?
>>>> * will the cluster start safely?
>> That definitely sounds racy to me. The best idea I can think of would be
>> to set all nodes except one in standby, and then shutdown pacemaker
>> everywhere...
> Really mean standby or rather maintenance to keep resources
> from switching to the still alive nodes during shutdown?

If all nodes are set to standby in one transaction, there is no switching,
just a stop of all resources.

> Regards,
> Klaus
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