I ran into something similiar when messing with my test cluster -
basically, it doesn't like existing GPT tables on devices.
I got in the habit of running 'gdisk /dev/sdX' and using the 'x'
(expert) and 'z' (zap) commands to get rid of the GPT table
prior to doing ceph setup.
On Thu, Feb 12, 2015
When trying to zap and prepare a disk it fails to find the partitions.
[ceph@ceph0-mon0 ~]$ ceph-deploy -v disk zap
ceph0-node1:/dev/mapper/35000c50031a1c08b
[ ceph_deploy.conf ][ DEBUG ] found configuration file at:
/home/ceph/.cephdeploy.conf
[ ceph_deploy.cli ][ INFO ] Invoked (1.5.21)
