unfound blocks IO or gives IO error?

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Hi all,

Quick question: does an IO with an unfound object result in an IO
error or should the IO block?

During a jewel to luminous upgrade some PGs passed through a state
with unfound objects for a few seconds. And this seems to match the
times when we had a few IO errors on RBD attached volumes.

Wondering what is the correct behaviour here...

Cheers, Dan
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