Minor inconsistency with ceph-deploy on Giant

Minor inconsistency with ceph-deploy on Giant

[Stephen Hindle]

Hi!

  Just thought I'd mention a minor inconsistency I noticed while
re-installing our cluster...
preparing an OSD with ceph-deploy will NOT activate it on a parttion
(node1:/sda1/sda2)
preparting an OSD with ceph-deploy WILL activate it on a disk (
node1:/dev/sdc)

I think I noticed similiar behavior with ceph-deploy osd create, but I
assumed I just messed up,
so I didnt document it.  This is probably more of an 'issue' as create is
supposed to activate it for you.

Manually issuing a ceph-deploy osd activate works fine to bring the
partition OSDs up.

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Re: Minor inconsistency with ceph-deploy on Giant

[Sage Weil]

On Mon, 2 Feb 2015, Stephen Hindle wrote:
> Hi!
> 
>   Just thought I'd mention a minor inconsistency I noticed while
> re-installing our cluster...
> preparing an OSD with ceph-deploy will NOT activate it on a parttion
> (node1:/sda1/sda2)
> preparting an OSD with ceph-deploy WILL activate it on a disk (
> node1:/dev/sdc)
> 
> I think I noticed similiar behavior with ceph-deploy osd create, but I
> assumed I just messed up,
> so I didnt document it.  This is probably more of an 'issue' as create is
> supposed to activate it for you.
> 
> Manually issuing a ceph-deploy osd activate works fine to bring the
> partition OSDs up.

This is an artifact of how activation works: we label GPT partitions so 
that udev can launch ceph-osd.  If you use existing partitions, they 
aren't GPT (probably) and aren't labeled accordingly.

I think the "fix" is to make sure the existing partitions are GPT 
partitions, and make sure that ceph-disk will relabel is possible (I 
forget if it does this now...)

sage