Hi, On 9/18/24 10:00, Szabo, Istvan (Agoda) wrote:
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.
The current recommended number of MONs is 5. A new cluster deployed with cephadm wants to start 5 MONs. When you have 3 MONs and 1 is down there is no room for any failure any more. A second MON going down takes your cluster offline. With 5 MONs you can lose 2 and the remaining 3 MONs still have quorum. Regards -- Robert Sander Heinlein Consulting GmbH Schwedter Str. 8/9b, 10119 Berlin https://www.heinlein-support.de Tel: 030 / 405051-43 Fax: 030 / 405051-19 Amtsgericht Berlin-Charlottenburg - HRB 220009 B Geschäftsführer: Peer Heinlein - Sitz: Berlin