Once you've created a crush map you need to edit it directly (either by
dumping it from the cluster, editing with the crush tool, and importing; or
via the ceph cli commands), rather than by updating config settings. I
believe doing so is explained in the ceph docs.

On Fri, Feb 2, 2018 at 4:47 AM Flemming Frandsen <
flemming.frand...@stibosystems.com> wrote:

> Hi, I'm just starting to play around with Ceph, so please excuse my
> complete lack of a clue if this question is covered somewhere, but I
> have been unable to find an answer.
> I have a single machine running Ceph which was set up with osd crush
> chooseleaf type = 0 in /etc/ceph/ceph.conf, now I've added a new machine
> with some new OSDs, so I'd like to change to osd crush chooseleaf type =
> 1 and have Ceph re-balance the replicas.
> How do I do that?
> Preferably I'd like to make the change without making the cluster
> unavailable.
> So far I've edited the config file and tried restarting daemons,
> including rebooting the entire OS, but I still see PGs that live only on
> one host.
> I've read the config docuemntation page but it doesn't mention what to
> do to make that specific config change take effect:
> http://docs.ceph.com/docs/master/rados/configuration/ceph-conf/
> I've barked up the crushmap tree a bit, but I did not see how "osd crush
> chooseleaf type" relates to that in any way.
> --
>   Regards Flemming Frandsen - Stibo Systems - DK - STEP Release Manager
>   Please use rele...@stibo.com for all Release Management requests
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