Description of problem:

I have several faulty luns and when I discovered devices and logged in I got an error in the gui that we cannot retrieve luns.
As long as these luns are logged in (not connected - just logged in) I cannot add any other targets from the storage. 

Version-Release number of selected component (if applicable):

vdsm-4.9.6-7.el6.x86_64

How reproducible:

100%

Steps to Reproduce:
1. have some faulty luns (dirty ones will be enough) and a new lun
2. try to login to the faulty luns
3. try to login to the good lun 
  
Actual results:

after trying to connect the 3ed faulty lun we get an error from vdsm and can no longer connect to any other luns. 

Expected results:

faulty luns are filtered in GUI. 
we should still be allowed to connect to operational luns

Additional info: full logs attached. 


vdsm error: 

Thread-324::ERROR::2012-04-19 18:04:48,882::task::853::TaskManager.Task::(_setError) Task=`c6a7fc90-de32-4086-bf9d-971a8d4e9e15`::Unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/task.py", line 861, 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 1488, in getDeviceList
    includePartitioned=options.get('includePartitioned', False))
  File "/usr/share/vdsm/storage/hsm.py", line 1513, in _getDeviceList
    for pv in lvm.getAllPVs():
  File "/usr/share/vdsm/storage/lvm.py", line 756, in getAllPVs
    return _lvminfo.getAllPvs()
  File "/usr/share/vdsm/storage/lvm.py", line 529, in getAllPvs
    pvs = self._reloadpvs()
  File "/usr/share/vdsm/storage/lvm.py", line 346, in _reloadpvs
    pv = makePV(*fields)
  File "/usr/share/vdsm/storage/lvm.py", line 200, in makePV
    name = fixPVName(args[1])
  File "/usr/share/vdsm/storage/lvm.py", line 195, in fixPVName
    dmId = devicemapper.getDmIdFromFile(devPath)
  File "/usr/share/vdsm/storage/devicemapper.py", line 35, in getDmIdFromFile
    raise OSError(errno.ENODEV, "Could not find dm device named `%s`" % path)
OSError: [Errno 19] Could not find dm device named `unknown device`
Thread-324::DEBUG::2012-04-19 18:04:48,883::task::872::TaskManager.Task::(_run) Task=`c6a7fc90-de32-4086-bf9d-971a8d4e9e15`::Task._run: c6a7fc90-de32-4086-bf9d-971a8d4e9e15 (3,) {} failed - stopping task
Thread-324::DEBUG::2012-04-19 18:04:48,884::task::1199::TaskManager.Task::(stop) Task=`c6a7fc90-de32-4086-bf9d-971a8d4e9e15`::stopping in state preparing (force False)
Thread-324::DEBUG::2012-04-19 18:04:48,884::task::978::TaskManager.Task::(_decref) Task=`c6a7fc90-de32-4086-bf9d-971a8d4e9e15`::ref 1 aborting True
Thread-324::INFO::2012-04-19 18:04:48,885::task::1157::TaskManager.Task::(prepare) Task=`c6a7fc90-de32-4086-bf9d-971a8d4e9e15`::aborting: Task is aborted: u'[Errno 19] Could not find dm device named `unknown device`' - code 100


backend: 

2012-04-19 18:09:21,993 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.BrokerCommandBase] (ajp--0.0.0.0-8009-7) Error code BlockDeviceActionError and error message VDSGenericException: VDSErrorException: Failed to GetDeviceListVDS, error = Error block device action: ()
2012-04-19 18:09:21,995 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.BrokerCommandBase] (ajp--0.0.0.0-8009-7) Command org.ovirt.engine.core.vdsbroker.vdsbroker.GetDeviceListVDSCommand return value 
 
Class Name: org.ovirt.engine.core.vdsbroker.vdsbroker.LUNListReturnForXmlRpc
lunList                       Null
mStatus                       Class Name: org.ovirt.engine.core.vdsbroker.vdsbroker.StatusForXmlRpc
mCode                         600
mMessage                      Error block device action: ()



2012-04-19 18:09:21,998 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.BrokerCommandBase] (ajp--0.0.0.0-8009-7) Vds: blond-vdsh
2012-04-19 18:09:21,999 ERROR [org.ovirt.engine.core.vdsbroker.VDSCommandBase] (ajp--0.0.0.0-8009-7) Command GetDeviceListVDS execution failed. Exception: VDSErrorException: VDSGenericException: VDSErrorException: Failed to GetDeviceListVDS, error = Error block device action: ()
2012-04-19 18:09:22,001 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.GetDeviceListVDSCommand] (ajp--0.0.0.0-8009-7) FINISH, GetDeviceListVDSCommand, log id: 7a3fc2e
2012-04-19 18:09:22,002 ERROR [org.ovirt.engine.core.bll.storage.GetDeviceListQuery] (ajp--0.0.0.0-8009-7) Query GetDeviceListQuery failed. Exception message is VdcBLLException: org.ovirt.engine.core.vdsbroker.vdsbroker.VDSErrorException: VDSGenericException: VDSErrorException: Failed to GetDeviceListVDS, error = Error block device action: ()
2012-04-19 18:10:00,001 INFO  [org.ovirt.engine.core.bll.AutoRecoveryManager] (QuartzScheduler_Worker-39) Checking autorecoverable hosts