Re: osd_pool_default_size

[Wido den Hollander <wido@widodh.nl>]

On 10/26/2012 10:17 AM, Sébastien Han wrote:
> Hi Cephers!
>
> Some question about this parameter:
>
> - Why does this parameter need to be in the [mon] section to work?

It's the monitor who is preparing the new pool before creating it. I had 
a discussion regarding this with Greg some time ago, can't re-call if 
this was on IRC or the ml though.

It however contradicts what's in the docs: 
http://ceph.com/docs/master/config-cluster/osd-config-ref/

The docs seem to be wrong at this point:

* src/mon/OSDMonitor.cc *

int OSDMonitor::prepare_new_pool(string& name, uint64_t auid, int 
crush_rule,
                                  unsigned pg_num, unsigned pgp_num)
{
..
..
   pending_inc.new_pools[pool].size = g_conf->osd_pool_default_size;
..
..
}

This is done by the monitor.

There seems to be some reference for this in src/osd/OSDMap.cc, but that 
seems to be for initializing the cluster since it creates the data, 
metadata and rbd pool there.

This was fixed in this commit: 
https://github.com/ceph/ceph/commit/1292436b8f88ce203bdba97278ce368b1dfa025f

Seems to be because of this message on the ml last year: 
http://comments.gmane.org/gmane.comp.file-systems.ceph.devel/2983

So yes, it is odd that something prefixed with "osd" should go into the 
mon section.

Wido

> - In my ceph.conf I set a default size of 3:
>
> # rados mkpool lol
> successfully created pool lol
>
> # ceph osd dump | grep lol
> pool 31 'lol' rep size 3 crush_ruleset 0 object_hash rjenkins pg_num 8
> pgp_num 8 last_change 430 owner 18446744073709551615
>
> Now if I retrieve the admin daemon I get,
>
> # ceph --admin-daemon /var/run/ceph/ceph-osd.0.asok config show | grep
> 'osd_pool_default_size'
> osd_pool_default_size = 2
>
> Why? Did I something wrong?
>
> Thanks :)
>
> Cheers!
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