The problem you are describing is called split-brain. Ceph has an odd number of monitors and quorum is required before objects can be served. The partition with the smaller number of monitors will wait harmlessly until connectivity is reestablished .
Ah right, that makes sense. Is this set in stone or can it be configured? I'm just thinking that in this scenario it could be beneficial to allow read-only access from the partition with the smaller number of monitors, if there are also clients that can only see those hosts. (For example, a business with two sites, and the link between them goes down, so client PCs can only see their site-local servers.)
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