Hi, you need to consider your resiliency requirements. With 3 MONs, you'll lose quorum if you have one MON in maintenance and another one fails during that window. You're safer with 5 MONs in such a case. We have been running our own cluster with 3 MONs for years without any issues, so it really depends. Zitat von "Szabo, Istvan (Agoda)" <Istvan.Szabo@agoda.com>:

Hi,

I went through some Redhat doc and saw this sentence which I didn't see in Ceph docs:

"The storage cluster can run with only one Ceph Monitor; however, to ensure high availability in a production storage cluster, Red Hat will only support deployments with at least three Ceph Monitor nodes. Red Hat recommends deploying a total of 5 Ceph Monitors for storage clusters exceeding 750 Ceph OSDs."

here: https://docs.redhat.com/en/documentation/red_hat_ceph_storage/4/html/install...

We will reach this number so wonder do we really need 5 mon? Currently we have 3 collocated mgr/mon on baremetal server with some multiste gw traffic, if needed I'd plan to simply add some mon on vm only.

Thank you

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