Happened again, this time with cs:trusty/ceph-osd-233:


unit-ceph-osd-0[9443]: 2016-05-01 22:09:21 INFO unit.ceph-osd/0.juju-log server.go:268 mon:44: osdize cmd: ['ceph-disk', 'prepare', '--fs-type', u'xfs', '--zap-disk', u'/dev/sdb']
unit-ceph-osd-0[9443]: 2016-05-01 22:09:22 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40 Creating new GPT entries.
unit-ceph-osd-0[9443]: 2016-05-01 22:09:22 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40 GPT data structures destroyed! You may now partition the disk using fdisk or
unit-ceph-osd-0[9443]: 2016-05-01 22:09:22 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40 other utilities.
unit-ceph-osd-0[9443]: 2016-05-01 22:09:24 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40 Creating new GPT entries.
unit-ceph-osd-0[9443]: 2016-05-01 22:09:24 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40 The operation has completed successfully.
unit-ceph-osd-0[9443]: 2016-05-01 22:09:25 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40 The operation has completed successfully.
unit-ceph-osd-0[9443]: 2016-05-01 22:09:26 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40 The operation has completed successfully.
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40 mkfs.xfs: cannot open /dev/sdb1: No such device or address
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40 ceph-disk: Error: Command '['/sbin/mkfs', '-t', 'xfs', '-f', '-i', 'size=2048', '--', '/dev/sdb1']' returned non-zero exit status 1
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 ERROR unit.ceph-osd/0.juju-log server.go:268 mon:44: Unable to initialize device: /dev/sdb
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40 Traceback (most recent call last):
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40   File "/var/lib/juju/agents/unit-ceph-osd-0/charm/hooks/mon-relation-changed", line 545, in <module>
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40     hooks.execute(sys.argv)
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40   File "/var/lib/juju/agents/unit-ceph-osd-0/charm/hooks/charmhelpers/core/hookenv.py", line 717, in execute
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40     self._hooks[hook_name]()
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40   File "/var/lib/juju/agents/unit-ceph-osd-0/charm/hooks/mon-relation-changed", line 475, in mon_relation
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40     prepare_disks_and_activate()
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40   File "/var/lib/juju/agents/unit-ceph-osd-0/charm/hooks/mon-relation-changed", line 398, in prepare_disks_and_activate
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40     config('osd-encrypt'))
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40   File "/var/lib/juju/agents/unit-ceph-osd-0/charm/hooks/ceph.py", line 662, in osdize
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40     reformat_osd, ignore_errors, encrypt)
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40   File "/var/lib/juju/agents/unit-ceph-osd-0/charm/hooks/ceph.py", line 717, in osdize_dev
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40     raise e
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 INFO unit.ceph-osd/0.mon-relation-changed logger.go:40 subprocess.CalledProcessError: Command '['ceph-disk', 'prepare', '--fs-type', u'xfs', '--zap-disk', u'/dev/sdb']' returned non-zero exit status 1
unit-ceph-osd-0[9443]: 2016-05-01 22:09:27 ERROR juju.worker.uniter.operation runhook.go:107 hook "mon-relation-changed" failed: exit status 1