➜  ceph  ceph-deploy osd activate mao:/dev/sd{a,b}3
[ceph_deploy.cli][INFO  ] Invoked (1.4.0): /usr/bin/ceph-deploy --overwrite-conf osd activate mao:/dev/sda3 mao:/dev/sdb3
[ceph_deploy.osd][DEBUG ] Activating cluster ceph disks mao:/dev/sda3: mao:/dev/sdb3:
[mao][DEBUG ] connected to host: mao
[mao][DEBUG ] detect platform information from remote host
[mao][DEBUG ] detect machine type
[ceph_deploy.osd][INFO  ] Distro info: CentOS 6.5 Final
[ceph_deploy.osd][DEBUG ] activating host mao disk /dev/sda3
[ceph_deploy.osd][DEBUG ] will use init type: sysvinit
[mao][INFO  ] Running command: sudo ceph-disk-activate --mark-init sysvinit --mount /dev/sda3
[mao][WARNIN] no monitors specified to connect to.
[mao][WARNIN] Error connecting to cluster: ObjectNotFound
[mao][WARNIN] ERROR:ceph-disk:Failed to activate
[mao][DEBUG ] connected to host: mao
[mao][DEBUG ] detect platform information from remote host
[mao][DEBUG ] detect machine type
[ceph_deploy.osd][INFO  ] Distro info: CentOS 6.5 Final
[ceph_deploy.osd][DEBUG ] activating host mao disk /dev/sdb3
[ceph_deploy.osd][DEBUG ] will use init type: sysvinit
[mao][INFO  ] Running command: sudo ceph-disk-activate --mark-init sysvinit --mount /dev/sdb3
[mao][WARNIN] no monitors specified to connect to.
[mao][WARNIN] Error connecting to cluster: ObjectNotFound
[mao][WARNIN] ERROR:ceph-disk:Failed to activate