On 7 Jul 2022, at 15:41, Dan van der Ster <dvand...@gmail.com> wrote:
> 
> How is one supposed to redeploy OSDs on a multi-PB cluster while the
> performance is degraded?

This is very strong point of view!

Good that this case can be fixed with set bluestore_prefer_deferred_size_hdd to 
128k, and I think we need analyze answer from Igor

* this is bug
* bluestore_prefer_deferred_size_hdd should be increased by operator, until 
migration to 4k will finished


k
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