Hello,
    This is the error i see in vdsm.log
Any pointers appreciated.

Thread-237764::INFO::2012-02-21 22:04:52,785::logUtils::37::dispatcher::(wrapper) Run and protect: createVG(vgname='2b63c813-6bd5-4488-904c-dba1c8e52822', devlist=['3600a0b800017dd4f00000e2e4a4ab484'], options=None) Thread-237764::DEBUG::2012-02-21 22:04:52,788::lvm::287::Storage.Misc.excCmd::(cmd) '/usr/bin/sudo -n /sbin/lvm pvcreate --config " devices { preferred_names = [\\"^/dev/mapper/\\"] ignore_suspended_devices=1 write_cache_state=0 disable_after_error_count=3 filter = [ \\"a%3600a0b800017dcec00000f324a4ab9ef|3600a0b800017dcec00000f334a4aba67|3600a0b800017dcec00000f344a4aba75|3600a0b800017dcec00000f354a4aba8d|3600a0b800017dd4f00000e2e4a4ab484|3600a0b800017dd4f00000e2f4a4ab56c%\\", \\"r%.*%\\" ] } global { locking_type=1 prioritise_write_locks=1 wait_for_locks=1 } backup { retain_min = 50 retain_days = 0 } " --metadatasize 128m --metadatacopies 2 --metadataignore y /dev/mapper/3600a0b800017dd4f00000e2e4a4ab484' (cwd None) Thread-237764::DEBUG::2012-02-21 22:04:52,854::lvm::287::Storage.Misc.excCmd::(cmd) FAILED: <err> = " Can't open /dev/mapper/3600a0b800017dd4f00000e2e4a4ab484 exclusively. Mounted filesystem?\n"; <rc> = 5 Thread-237764::DEBUG::2012-02-21 22:04:52,857::lvm::287::Storage.Misc.excCmd::(cmd) '/usr/bin/sudo -n /sbin/lvm pvs --config " devices { preferred_names = [\\"^/dev/mapper/\\"] ignore_suspended_devices=1 write_cache_state=0 disable_after_error_count=3 filter = [ \\"a%3600a0b800017dcec00000f324a4ab9ef|3600a0b800017dcec00000f334a4aba67|3600a0b800017dcec00000f344a4aba75|3600a0b800017dcec00000f354a4aba8d|3600a0b800017dd4f00000e2e4a4ab484|3600a0b800017dd4f00000e2f4a4ab56c%\\", \\"r%.*%\\" ] } global { locking_type=1 prioritise_write_locks=1 wait_for_locks=1 } backup { retain_min = 50 retain_days = 0 } " -o vg_name,pv_name --noheading /dev/mapper/3600a0b800017dd4f00000e2e4a4ab484' (cwd None) Thread-237764::DEBUG::2012-02-21 22:04:52,914::lvm::287::Storage.Misc.excCmd::(cmd) FAILED: <err> = ' No physical volume label read from /dev/mapper/3600a0b800017dd4f00000e2e4a4ab484\n Failed to read physical volume "/dev/mapper/3600a0b800017dd4f00000e2e4a4ab484"\n'; <rc> = 5 Thread-237764::ERROR::2012-02-21 22:04:52,916::task::855::TaskManager.Task::(_setError) Task=`17d5267f-fe25-49d4-9a7d-e04f2785d3b7`::Unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/task.py", line 863, in _run
    return fn(*args, **kargs)
  File "/usr/share/vdsm/logUtils.py", line 38, in wrapper
    res = f(*args, **kwargs)
  File "/usr/share/vdsm/storage/hsm.py", line 1556, in createVG
    metadataSize=blockSD.VG_METADATASIZE)
  File "/usr/share/vdsm/storage/lvm.py", line 796, in createVG
    _initpvs(pvs, metadataSize)
  File "/usr/share/vdsm/storage/lvm.py", line 634, in _initpvs
    found, notFound)
PhysDevInitializationError: Failed to initialize physical device: ('found: %s notFound: %s', {}, <generator object <genexpr> at 0x7fd8c031a780>) Thread-237764::DEBUG::2012-02-21 22:04:52,942::task::874::TaskManager.Task::(_run) Task=`17d5267f-fe25-49d4-9a7d-e04f2785d3b7`::Task._run: 17d5267f-fe25-49d4-9a7d-e04f2785d3b7 ('2b63c813-6bd5-4488-904c-dba1c8e52822', ['3600a0b800017dd4f00000e2e4a4ab484']) {} failed - stopping task Thread-237764::DEBUG::2012-02-21 22:04:52,942::task::1201::TaskManager.Task::(stop) Task=`17d5267f-fe25-49d4-9a7d-e04f2785d3b7`::stopping in state preparing (force False) Thread-237764::DEBUG::2012-02-21 22:04:52,942::task::980::TaskManager.Task::(_decref) Task=`17d5267f-fe25-49d4-9a7d-e04f2785d3b7`::ref 1 aborting True Thread-237764::INFO::2012-02-21 22:04:52,943::task::1159::TaskManager.Task::(prepare) Task=`17d5267f-fe25-49d4-9a7d-e04f2785d3b7`::aborting: Task is aborted: 'Failed to initialize physical device' - code 601 Thread-237764::DEBUG::2012-02-21 22:04:52,943::task::1164::TaskManager.Task::(prepare) Task=`17d5267f-fe25-49d4-9a7d-e04f2785d3b7`::Prepare: aborted: Failed to initialize physical device Thread-237764::DEBUG::2012-02-21 22:04:52,943::task::980::TaskManager.Task::(_decref) Task=`17d5267f-fe25-49d4-9a7d-e04f2785d3b7`::ref 0 aborting True Thread-237764::DEBUG::2012-02-21 22:04:52,943::task::915::TaskManager.Task::(_doAbort) Task=`17d5267f-fe25-49d4-9a7d-e04f2785d3b7`::Task._doAbort: force False


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