+1 on adding them all at the same time.
All these methods that gradually increase the weight aren't really necessary in newer releases of Ceph.
Paul
--
Paul Emmerich
Looking for help with your Ceph cluster? Contact us at https://croit.io
croit GmbH
Freseniusstr. 31h
81247 München
www.croit.io
Tel: +49 89 1896585 90
Paul Emmerich
Looking for help with your Ceph cluster? Contact us at https://croit.io
croit GmbH
Freseniusstr. 31h
81247 München
www.croit.io
Tel: +49 89 1896585 90
On Wed, Jul 24, 2019 at 8:59 PM Reed Dier <reed.dier@xxxxxxxxxxx> wrote:
Just chiming in to say that this too has been my preferred method for adding [large numbers of] OSDs._______________________________________________Set the norebalance nobackfill flags.Create all the OSDs, and verify everything looks good.Make sure my max_backfills, recovery_max_active are as expected.Make sure everything has peered.Unset flags and let it run.One crush map change, one data movement.Reed
That works, but with newer releases I've been doing this:
- Make sure cluster is HEALTH_OK
- Set the 'norebalance' flag (and usually nobackfill)
- Add all the OSDs
- Wait for the PGs to peer. I usually wait a few minutes
- Remove the norebalance and nobackfill flag
- Wait for HEALTH_OK
Wido
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