Not recently, but a few years ago, I used the "Whole host replacement" using "swap-bucket": https://docs.ceph.com/en/latest/rados/operations/bluestore-migration/ This worked really nicely. With source and destination about the same host CRUSH weight, most PGs are moved directly from source to destination. So also the copy speed was more or less the same most of the time. Cheers, Harry On 4/28/26 11:08, Denis Polom via ceph-users wrote:

you can control max_backfills and some others if you  set osd_mclock_override_recovery_settings to true

On 4/28/26 10:57, Janne Johansson via ceph-users wrote:

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Another approach is to set the flags, destroy the OSDs on a single host, redeploy them, set your backfill/recovery throttles down to 1, and unset the flags. This is harder with mclock right? With wpq you can still control max_backfills, but not with mclock unless I am mistaken.

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