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@xxxxxxxxx>:
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/installation_guide/what-is-red-hat-ceph-storage_install#what-is-red-hat-ceph-storage_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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