old PG left behind after remapping

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Hi,

after larger moves of serveral placement groups we tried to empty 3 of
our 66 osds by slowly setting weight of them to 0 within the crushmap.

After move completed we're still experiencing a large amount of files
left on that osd-devices.

For example pg 5.117:
osdmap e56712 pg 5.117 (5.117) -> up [7,59] acting [7,59]

But there's still a filled current/5.117_head - Directory on osd 22

Neither scrubbing nor deep scrubbing seems to cleanup the osd's (I think
that's correct because scrubbing cleans "within pg's".

Is there a "scrub osd" - Command to automatically (and savely) get rid
of this left files? Is it otherwise save to delete them manually?

-- 
Kind regards
 Michael Metz-Martini

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