Re: How is split brain situations handled in ceph?

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> Op 26 oktober 2016 om 15:51 schreef J David <j.david.lists@xxxxxxxxx>:
> 
> 
> On Wed, Oct 26, 2016 at 8:55 AM, Andreas Davour <ante@xxxxxxxxxxxx> wrote:
> > If there are 1 MON in B, that cluster will have quorum within itself and
> > keep running, and in A the MON cluster will vote and reach quorum again.
> 
> Quorum requires a majority of all monitors.  One monitor by itself (in
> a cluster with at least three monitors) will never form a quorum.

To add, RADOS is always synchronous when writing. If min_size isn't online or can't be reached a write will not succeed.

So in this case, the DC with just one MON and copy of OSDs remaining will NEVER accept a write.

Wido

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