All;

This might be a noob type question, but this thread is interesting, and there's 
one thing I would like clarified.

David Turner mentions setting 3 flags on OSDs, Götz has mentioned 5 flags, do 
the commands need to be run on all OSD nodes, or just one?

Thank you,

Dominic L. Hilsbos, MBA 
Director – Information Technology 
Perform Air International Inc.
dhils...@performair.com 
300 S. Hamilton Pl. 
Gilbert, AZ 85233 
Phone: (480) 610-3500 
Fax: (480) 610-3501 
www.PerformAir.com


From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of David 
Turner
Sent: Wednesday, February 14, 2018 9:02 AM
To: Götz Reinicke
Cc: ceph-users
Subject: Re: [ceph-users] Shutting down half / full cluster

ceph osd set noout
ceph osd set nobackfill
ceph osd set norecover

Noout will prevent OSDs from being marked out during the maintenance and no PGs 
will be able to shift data around with the other 2 flags.  After everything is 
done, unset the 3 flags and you're good to go.

On Wed, Feb 14, 2018 at 5:25 AM Götz Reinicke <goetz.reini...@filmakademie.de> 
wrote:
Thanks!

Götz



Am 14.02.2018 um 11:16 schrieb Kai Wagner <kwag...@suse.com>:

Hi,
maybe it's worth looking at this:
http://lists.ceph.com/pipermail/ceph-users-ceph.com/2017-April/017378.html
Kai

On 02/14/2018 11:06 AM, Götz Reinicke wrote:
Hi,

We have some work to do on our power lines for all building and we have to shut 
down all systems. So there is also no traffic on any ceph client.

Pitty, we have to shot down some ceph nodes too in an affected building.

To avoid rebalancing - as I see there is no need for it, as there is no traffic 
on clients - how can I safely set the remaining cluster nodes in a „keep calm 
and wait“ state?

Is that the noout option?

Thanks for feedback and suggestions! Regards . Götz



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Götz Reinicke 
IT-Koordinator
IT-OfficeNet
+49 7141 969 82420 
goetz.reini...@filmakademie.de
Filmakademie Baden-Württemberg GmbH 
Akademiehof 10 71638 Ludwigsburg 
http://www.filmakademie.de 




Eintragung Amtsgericht Stuttgart HRB 205016
Vorsitzende des Aufsichtsrates:
Petra Olschowski
Staatssekretärin im Ministerium für Wissenschaft,
Forschung und Kunst Baden-Württemberg
Geschäftsführer:
Prof. Thomas Schadt 



Götz Reinicke 
IT-Koordinator
IT-OfficeNet
+49 7141 969 82420 
goetz.reini...@filmakademie.de
Filmakademie Baden-Württemberg GmbH 
Akademiehof 10 71638 Ludwigsburg 
http://www.filmakademie.de 




Eintragung Amtsgericht Stuttgart HRB 205016
Vorsitzende des Aufsichtsrates:
Petra Olschowski
Staatssekretärin im Ministerium für Wissenschaft,
Forschung und Kunst Baden-Württemberg
Geschäftsführer:
Prof. Thomas Schadt 

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