This is not speculation:  I have personally experienced this with an inherited 
2R cluster.

> On Mar 3, 2023, at 04:07, Janne Johansson <[email protected]> wrote:
> 
> 
> Do not assume the last PG needs to die in a horrible fire, killing
> several DC operators with it, it only takes a REALLY small outage, a
> fluke restart, a short network glitch for it to be away, while still
> having the last acknowledged write to it, making any 1-2-3-4-5 other
> PG replicas of it useless, since the cluster will know that this one
> missing OSD has the latest writes, and no other PG can replace it, it
> can't be "repaired" from others.

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