Re: [ceph-commit] HEALTH_WARN 192 pgs degraded

[Mark Kirkwood <mark.kirkwood@catalyst.net.nz>]

On 25/10/12 04:40, Sage Weil wrote:
> [moved to ceph-devel]
>
> On Wed, 24 Oct 2012, Roman Alekseev wrote:
>> Hi there,
>>
>>
>> I've made simple fresh installation of ceph on Debian server with the
>> following configuration:
>> ************************
>> [global]
>>      debug ms = 0
>> [osd]
>>      osd journal size = 1000
>>      filestore xattr use omap = true
>>
>> [mon.a]
>>
>>      host = serv1
>>      mon addr = 192.168.0.10:6789
>>
>> [osd.0]
>>       host = serv1
>>
>> [mds.a]
>>      host = serv1
>> ************************
>>
>> Seems everything is working fine but when I perform "ceph health" command I
>> receive the next message:
>> HEALTH_WARN 192 pgs degraded; 192 pgs stuck unclean; recovery 21/42 degraded
>> (50.000%)
> This is simply because you only have 1 osd but the default policy is 2x
> replication.  As such, all PGs are 'degraded' because they are only
> replicated once.
>
> If you add another OSD to your cluster the warning will go away.
>
> sage
>

The other alternative is to just set the pool(s) replication size to 1, 
if you are just wanting a single osd for (say) testing:

$ ceph osd pool set <your pool(s)> size 1

I find it I need to restart ceph after doing the above, it then sorts 
itself out to a nice healthy status!

Regards

Mark