Re: Problems enabling automatic balancer

[Massimo Sgaravatto <massimo.sgaravatto@xxxxxxxxx>]

I think I found myself the problem (for the time being I am debugging the issue on a testbed):

[root@c-mon-01 ceph]# ceph osd crush weight-set create-compat

Error EPERM: crush map contains one or more bucket(s) that are not straw2

So I issued:

[root@c-mon-01 ceph]# ceph osd crush set-all-straw-buckets-to-straw2

Error EINVAL: new crush map requires client version hammer but require_min_compat_client is firefly

So:

[root@c-mon-01 ceph]# ceph osd set-require-min-compat-client jewel

set require_min_compat_client to jewel

Now the set-all-straw-buckets-to-straw2 should work:

[root@c-mon-01 ceph]# ceph osd crush set-all-straw-buckets-to-straw2

Indeed.

And when I start the balancer:

[root@c-mon-01 ceph]# ceph balancer on

 I can't see anymore the problem

On Fri, Jan 11, 2019 at 3:58 PM Massimo Sgaravatto <massimo.sgaravatto@xxxxxxxxx> wrote:

I am trying to enable the automatic balancer in my Luminous ceph cluster, following the documentation at:

http://docs.ceph.com/docs/luminous/mgr/balancer/

[root@ceph-mon-01 ~]# ceph balancer status

{

    "active": true, 

    "plans": [], 

    "mode": "crush-compat"

}

After having issued the command:

[root@ceph-mon-01 ~]# ceph balancer on

in the manager log file I see:

2019-01-11 15:50:43.087370 7f1afd496700  0 mgr[balancer] Error creating compat weight-set

Any hints how to  debug this ?

Thanks, Massimo

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