> Le 14 sept. 2025 à 10:15, Eugen Block <[email protected]> a écrit :
> 
> Wasn't the default for bluestore_min_alloc_size changed between N and P from 
> 64k to 4k? That could also play a role when you had to rebuild your OSDs. And 
> wasn't there also a Bluestore tombstone cleanup introduced? I don't know when 
> exactly that was, but all these things could play a role, in addition to what 
> the others wrote, especially the relatively small SSD OSDs could play a 
> bigger role as Anthony already suggested. So it won't be easy to pinpoint the 
> root cause, there are too many factors involved, unless you have captured 
> logs and some additional terminal output during the rebuild like 'ceph osd 
> df', or how big the PGs on the SSDs are and how exactly you rebuilt the OSDs. 
> A lot of questions…


Yes indeed. Good questions…. Don’t have the answer. But  it gives me maybe some 
clues to dig in.

Olivier

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