Guido,
My apologies. I seem to have omitted the PG troubleshooting section from the index. It has been addressed. See http://ceph.com/docs/master/rados/troubleshooting/troubleshooting-pg/
Ceph OSDs peer and check on each other. So running a cluster with only one OSD is not recommended. Operationally, it's perfectly fine to bootstrap a cluster that way, but an operating cluster should have at least two OSDs running. See http://ceph.com/docs/master/rados/operations/monitoring-osd-pg/#peering and http://ceph.com/docs/master/rados/configuration/mon-osd-interaction/ to learn how OSDs interact with each other and monitors.
Regards,
John
On Mon, May 6, 2013 at 8:04 AM, Guido Winkelmann <guido-ceph@xxxxxxxxxxxxxxxxx> wrote:
Am Montag, 6. Mai 2013, 16:59:12 schrieb Wido den Hollander:
> On 05/06/2013 04:51 PM, Guido Winkelmann wrote:I set size to 1 now, too. ceph -s no longer reports degraded pgs now, but I
> > Am Montag, 6. Mai 2013, 16:41:43 schrieb Wido den Hollander:
> >> On 05/06/2013 04:15 PM, Guido Winkelmann wrote:
> >>> Am Montag, 6. Mai 2013, 16:05:31 schrieb Wido den Hollander:
> >>>> On 05/06/2013 04:00 PM, Guido Winkelmann wrote:
> >>>>> Hi,
> >>>>>
> >>>>> How do I run a 1-node cluster with no replication?
> >>>>>
> >>>>> I'm trying to run a small 1-node cluster on my local workstation and
> >>>>> another on my notebook for experimentation/development purposes, but
> >>>>> since I only have on OSD, I'm always getting HEALTH_WARN as the
> >>>>> cluster
> >>>>> status from ceph -s. Can I somehow tell ceph to just not bother with
> >>>>> replication for this cluster?
> >>>>
> >>>> Have you set min_size to 1 for all the pools?
> >>>
> >>> You mean in the crushmap?
> >>
> >> No, it's pool setting.
> >>
> >> See: http://ceph.com/docs/master/rados/operations/pools/#set-pool-values
> >
> > Hm, I set that to 1 now, and nothing changed:
> Have you also set "size" to 1? Meaning no replication.
>
> Both size and min_size should be set to 1.
still get a HEALTH_WARN:
$ ceph -s
health HEALTH_WARN 384 pgs stuck unclean
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