Dear Rainer,
hmm, maybe the option is ignored or not implemented properly. This option set to true should have the same effect as reducing min_size *except* that new writes will not go to non-redundant storage. When reducing min-size, a critically degraded PG will accept new writes, which is the danger of data-loss mentioned before and avoided if only recovery ops are allowed on such PGs.
Can you open a tracker about your observation that reducing min-size was necessary and helped despite osd_allow_recovery_below_min_size=true?
Best regards,
=================
Frank Schilder
AIT Risø Campus
Bygning 109, rum S14
________________________________________
From: Rainer Krienke <krienke@xxxxxxxxxxxxxx>
Sent: 30 March 2021 13:30:00
To: Frank Schilder; Eugen Block; ceph-users@xxxxxxx
Subject: Re: Re: ceph Nautilus lost two disk over night everything hangs
Hello Frank,
the option is actually set. On one of my monitors:
# ceph daemon /var/run/ceph/ceph-mon.*.asok config show|grep
osd_allow_recovery_below_min_size
"osd_allow_recovery_below_min_size": "true",
Thank you very much
Rainer
Am 30.03.21 um 13:20 schrieb Frank Schilder:
> Hi, this is odd. The problem with recovery when sufficiently many but less than min_size shards are present should have been resolved with osd_allow_recovery_below_min_size=true. It is really dangerous to reduce min_size below k+1 and, in fact, should never be necessary for recovery. Can you check if this option is present and set to true? If it is not working as intended, a tracker ticker might be in order.
>
> Best regards,
> =================
> Frank Schilder
> AIT Risø Campus
> Bygning 109, rum S14
>
--
Rainer Krienke, Uni Koblenz, Rechenzentrum, A22, Universitaetsstrasse 1
56070 Koblenz, Web: http://www.uni-koblenz.de/~krienke, Tel: +49261287 1312
PGP: http://www.uni-koblenz.de/~krienke/mypgp.html, Fax: +49261287
1001312
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