Dear Mark and Nico,
I think this might be the time to file a tracker report. As far as I can see, your set-up
is as it should be, OSD operations on your clusters should behave exactly as on ours. I
don't know of any other configuration option that influences placement calculation.
The problems you (Nico in particular) describe seem serious enough. I heard also other
reports of admin operations killing a cluster starting with Nautilus, most notably this
one
https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/W4M5XQRDBLX…
. Maybe there is/are regressions with crush placement computations (and others)? I will
add this to the list of tests before considering to upgrade from mimic.
Best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
________________________________________
From: Marc Roos <M.Roos(a)f1-outsourcing.eu>
Sent: 30 September 2020 22:26:11
To: eblock; Frank Schilder
Cc: ceph-users; nico.schottelius
Subject: RE: [ceph-users] Re: hdd pg's migrating when converting ssd class osd's
I am not sure, but it looks like this remapping at hdd's is not being
done when adding back the same ssd osd.