[ceph-users] Re: Are replicas 4 or 6 safe during network partition? Will there be split-brain?

Hi, On 07.07.23 16:52, jcichra@cloudflare.com wrote:

There are two sites, A and B. There are 5 mons, 2 in A, 3 in B. Looking at just one PG and 4 replicas, we have 2 replicas in site A and 2 replicas in site B. Site A holds the primary OSD for this PG. When a network split happens, I/O would still be working in site A since there are still 2 OSDs, even without mon quorum.

The site without MON quorum will stop to work completely. Regards -- Robert Sander Heinlein Consulting GmbH Schwedter Str. 8/9b, 10119 Berlin http://www.heinlein-support.de Tel: 030 / 405051-43 Fax: 030 / 405051-19 Zwangsangaben lt. §35a GmbHG: HRB 220009 B / Amtsgericht Berlin-Charlottenburg, Geschäftsführer: Peer Heinlein -- Sitz: Berlin