On 07/07/2016 04:17 PM, Fran Barrera wrote:
Hi all,
I have a cluster setup AIO with only one monitor and now I've created
another monitor in other server following this doc
http://docs.ceph.com/docs/master/rados/operations/add-or-rm-mons/ but my
problem is if I stop the AIO monitor, the cluster stop working. It seems
like the ceph is not updated with the new mon or something
In the doc you quoted, one can read:
"Due to the nature of Paxos, Ceph requires a majority of monitors
running to establish a quorum (thus establishing consensus).
[...]
For instance, on a 2 monitor deployment, no failures can be tolerated in
order to maintain a quorum; with 3 monitors, one failure can be
tolerated; [...]"
And in a box beneath, you also see
"Note: A majority of monitors in your cluster must be able to reach
each other in order to establish a quorum."
So, say you have 2 monitors and you need a majority of them to be up,
running, and able to communicate with each other in order to form
quorum. What's a majority of 2? How many failures can you tolerate?
-Joao
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