[kjetijor]

I've used ceph since firefly - and noout existed back then as well.

Assuming that you run with 3 failure domains, and only maintain one failure domain at a time. Noout mostly gets the job done. What it doesn't do for you is save you from an actual failure in a different failure domain during maintenance. EC pools & k+(m>=2) or replication > 3 - would cover this as well.

We've had mostly great success with noout + maintain failure domain at a time, wait for recovery, proceed to next failure domain, repeat until done. To the point where we've been comfortable leaving a lot of the babysitting & work to machines.