[root@os004cadm001 my-cluster]# ceph-deploy osd prepare --fs-type btrfs os004ceph001.omnovo.com:mapper/ceph os004ceph002.omnovo.com:mapper/ceph os004ceph003.omnovo.com:mapper/ceph
[ceph_deploy.conf][DEBUG ] found configuration file at: /root/.cephdeploy.conf
[ceph_deploy.cli][INFO  ] Invoked (1.5.21): /usr/bin/ceph-deploy osd prepare --fs-type btrfs os004ceph001.omnovo.com:mapper/ceph os004ceph002.omnovo.com:mapper/ceph os004ceph003.omnovo.com:mapper/ceph
[ceph_deploy.osd][DEBUG ] Preparing cluster ceph disks os004ceph001.omnovo.com:/dev/mapper/ceph: os004ceph002.omnovo.com:/dev/mapper/ceph: os004ceph003.omnovo.com:/dev/mapper/ceph:
[os004ceph001.omnovo.com][DEBUG ] connected to host: os004ceph001.omnovo.com
[os004ceph001.omnovo.com][DEBUG ] detect platform information from remote host
[os004ceph001.omnovo.com][DEBUG ] detect machine type
[ceph_deploy.osd][INFO  ] Distro info: CentOS 6.5 Final
[ceph_deploy.osd][DEBUG ] Deploying osd to os004ceph001.omnovo.com
[os004ceph001.omnovo.com][DEBUG ] write cluster configuration to /etc/ceph/{cluster}.conf
[os004ceph001.omnovo.com][INFO  ] Running command: udevadm trigger --subsystem-match=block --action=add
[ceph_deploy.osd][DEBUG ] Preparing host os004ceph001.omnovo.com disk /dev/mapper/ceph journal None activate False
[os004ceph001.omnovo.com][INFO  ] Running command: ceph-disk -v prepare --fs-type btrfs --cluster ceph -- /dev/mapper/ceph
[os004ceph001.omnovo.com][WARNIN] INFO:ceph-disk:Running command: /usr/bin/ceph-osd --cluster=ceph --show-config-value=fsid
[os004ceph001.omnovo.com][WARNIN] INFO:ceph-disk:Running command: /usr/bin/ceph-conf --cluster=ceph --name=osd. --lookup osd_mkfs_options_btrfs
[os004ceph001.omnovo.com][WARNIN] INFO:ceph-disk:Running command: /usr/bin/ceph-conf --cluster=ceph --name=osd. --lookup osd_fs_mkfs_options_btrfs
[os004ceph001.omnovo.com][WARNIN] INFO:ceph-disk:Running command: /usr/bin/ceph-conf --cluster=ceph --name=osd. --lookup osd_mount_options_btrfs
[os004ceph001.omnovo.com][WARNIN] INFO:ceph-disk:Running command: /usr/bin/ceph-conf --cluster=ceph --name=osd. --lookup osd_fs_mount_options_btrfs
[os004ceph001.omnovo.com][WARNIN] INFO:ceph-disk:Running command: /usr/bin/ceph-osd --cluster=ceph --show-config-value=osd_journal_size
[os004ceph001.omnovo.com][WARNIN] INFO:ceph-disk:Will colocate journal with data on /dev/mapper/ceph
[os004ceph001.omnovo.com][WARNIN] DEBUG:ceph-disk:Creating journal partition num 2 size 5120 on /dev/mapper/ceph
[os004ceph001.omnovo.com][WARNIN] INFO:ceph-disk:Running command: /usr/sbin/sgdisk --new=2:0:5120M --change-name=2:ceph journal --partition-guid=2:94bc49d1-a1f6-485d-940a-4ce00d2059b8 --typecode=2:45b0969e-9b03-4f30-b4c6-b4b80ceff106 --mbrtogpt -- /dev/mapper/ceph
[os004ceph001.omnovo.com][WARNIN] Could not create partition 2 from 10485761 to 10485760
[os004ceph001.omnovo.com][WARNIN] Error encountered; not saving changes.
[os004ceph001.omnovo.com][WARNIN] ceph-disk: Error: Command '['/usr/sbin/sgdisk', '--new=2:0:5120M', '--change-name=2:ceph journal', '--partition-guid=2:94bc49d1-a1f6-485d-940a-4ce00d2059b8', '--typecode=2:45b0969e-9b03-4f30-b4c6-b4b80ceff106', '--mbrtogpt', '--', '/dev/mapper/ceph']' returned non-zero exit status 4
[os004ceph001.omnovo.com][ERROR ] RuntimeError: command returned non-zero exit status: 1
[ceph_deploy.osd][ERROR ] Failed to execute command: ceph-disk -v prepare --fs-type btrfs --cluster ceph -- /dev/mapper/ceph