Re: Theory about min_size and its implications

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>  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.

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