> but what is the problem with only one active PG? > someone pointed out "split brain" but I am unsure about this. I think Paxos will ensure that split-brain doesn’t happen by virtue of needing >50% of the mon quorum to be up. > i think what happens in the worst case is this: > only 1 PG is available, client writes changes to this PG, the disk of this 1 PG dies as well That’s part of it. Overlapping failures *do* happen. > - so i guess we'd need to restore the data from the 2 offline PGs in the room that is down and we would have lots of trouble with restoring and also with data inconsistency, right? Yes. _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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