[ClusterLabs] Sub-clusters / super-clusters?

Andrei Borzenkov arvidjaar at gmail.com
Tue Aug 3 05:23:31 EDT 2021

On Tue, Aug 3, 2021 at 11:40 AM Antony Stone
<Antony.Stone at ha.open.source.it> wrote:
> To implement the above "one resource which can run anywhere, but only a single
> instance", I joined together clusters A and B, and placed the corresponding
> location constraints on the resources I want only at A and the ones I want
> only at B.  I then added the resource with no location constraint, and it runs
> anywhere, just once.
> So far, so good.
> The problem is:
> With the two independent clusters, if two machines in city A fail, then
> Cluster A fails completely (no quorum), and Cluster B continues working.  That
> means I still get phone calls.
> With the new setup, if two machines in city A fail, then _both_ clusters stop
> working and I have no functional resources anywhere.

You need to provide more details. All resources running on remaining
nodes should continue to run.

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