Hello
I have a problem with oVirt Hosted Engine Setup version: 4.0.5.5-1.el7.centos.
Setup is using FCP SAN for data and engine.
Cluster has worked fine for a while. It has two hosts with VMs running.
I extended storage with an additional LUN recently. This LUN seems to
be gone from data domain and one VM is paused which I assume has data
on that device.

Got these errors in events:

Apr 24, 2017 10:26:05 AM
Failed to activate Storage Domain SD (Data Center DC) by admin@internal-authz
Apr 10, 2017 3:38:08 PM
Status of host cl01 was set to Up.
Apr 10, 2017 3:38:03 PM
Host cl01 does not enforce SELinux. Current status: DISABLED
Apr 10, 2017 3:37:58 PM
Host cl01 is initializing. Message: Recovering from crash or Initializing
Apr 10, 2017 3:37:58 PM
VDSM cl01 command failed: Recovering from crash or Initializing
Apr 10, 2017 3:37:46 PM
Failed to Reconstruct Master Domain for Data Center DC.
Apr 10, 2017 3:37:46 PM
Host cl01 is not responding. Host cannot be fenced automatically
because power management for the host is disabled.
Apr 10, 2017 3:37:46 PM
VDSM cl01 command failed: Broken pipe
Apr 10, 2017 3:37:46 PM
VDSM cl01 command failed: Broken pipe
Apr 10, 2017 3:32:45 PM
Invalid status on Data Center DC. Setting Data Center status to Non
Responsive (On host cl01, Error: General Exception).
Apr 10, 2017 3:32:45 PM
VDSM cl01 command failed: [Errno 19] Could not find dm device named `[unknown]`
Apr 7, 2017 1:28:04 PM
VM HostedEngine is down with error. Exit message: resource busy:
Failed to acquire lock: error -243.
Apr 7, 2017 1:28:02 PM
Storage Pool Manager runs on Host cl01 (Address: cl01).
Apr 7, 2017 1:27:59 PM
Invalid status on Data Center DC. Setting status to Non Responsive.
Apr 7, 2017 1:27:53 PM
Host cl02 does not enforce SELinux. Current status: DISABLED
Apr 7, 2017 1:27:52 PM
Host cl01 does not enforce SELinux. Current status: DISABLED
Apr 7, 2017 1:27:49 PM
Affinity Rules Enforcement Manager started.
Apr 7, 2017 1:27:34 PM
ETL Service Started
Apr 7, 2017 1:26:01 PM
ETL Service Stopped
Apr 3, 2017 1:22:54 PM
Shutdown of VM HostedEngine failed.
Apr 3, 2017 1:22:52 PM
Storage Pool Manager runs on Host cl01 (Address: cl01).
Apr 3, 2017 1:22:49 PM
Invalid status on Data Center DC. Setting status to Non Responsive.


Master data domain is inactive.


vdsm.log:

jsonrpc.Executor/5::INFO::2017-04-20
07:01:26,796::lvm::1226::Storage.LVM::(activateLVs) Refreshing lvs:
vg=bd616961-6da7-4eb0-939e-330b0a3fea6e lvs=['ids']
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:26,796::lvm::288::Storage.Misc.excCmd::(cmd) /usr/bin/taskset
--cpu-list 0-39 /usr/bin/sudo -n /usr/sbin/lvm lvchange --config '
devices { preferred_names = ["^/dev/mapper/"] ignore_suspended_d
evices=1 write_cache_state=0 disable_after_error_count=3 filter = [
'\''a|/dev/mapper/360050768018182b6c00000000000099e|[unknown]|'\'',
'\''r|.*|'\'' ] }  global {  locking_type=1  prioritise_write_locks=1
wait_for_locks=1  use_lvmetad=
0 }  backup {  retain_min = 50  retain_days = 0 } ' --refresh
bd616961-6da7-4eb0-939e-330b0a3fea6e/ids (cwd None)
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:26,880::lvm::288::Storage.Misc.excCmd::(cmd) SUCCESS: <err> = "
WARNING: Not using lvmetad because config setting use_lvmetad=0.\n
WARNING: To avoid corruption, rescan devices to make changes
 visible (pvscan --cache).\n  Couldn't find device with uuid
jDB9VW-bNqY-UIKc-XxXp-xnyK-ZTlt-7Cpa1U.\n"; <rc> = 0
jsonrpc.Executor/5::INFO::2017-04-20
07:01:26,881::lvm::1226::Storage.LVM::(activateLVs) Refreshing lvs:
vg=bd616961-6da7-4eb0-939e-330b0a3fea6e lvs=['leases']
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:26,881::lvm::288::Storage.Misc.excCmd::(cmd) /usr/bin/taskset
--cpu-list 0-39 /usr/bin/sudo -n /usr/sbin/lvm lvchange --config '
devices { preferred_names = ["^/dev/mapper/"] ignore_suspended_d
evices=1 write_cache_state=0 disable_after_error_count=3 filter = [
'\''a|/dev/mapper/360050768018182b6c00000000000099e|[unknown]|'\'',
'\''r|.*|'\'' ] }  global {  locking_type=1  prioritise_write_locks=1
wait_for_locks=1  use_lvmetad=
0 }  backup {  retain_min = 50  retain_days = 0 } ' --refresh
bd616961-6da7-4eb0-939e-330b0a3fea6e/leases (cwd None)
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:26,973::lvm::288::Storage.Misc.excCmd::(cmd) SUCCESS: <err> = "
WARNING: Not using lvmetad because config setting use_lvmetad=0.\n
WARNING: To avoid corruption, rescan devices to make changes
 visible (pvscan --cache).\n  Couldn't find device with uuid
jDB9VW-bNqY-UIKc-XxXp-xnyK-ZTlt-7Cpa1U.\n"; <rc> = 0
jsonrpc.Executor/5::INFO::2017-04-20
07:01:26,973::lvm::1226::Storage.LVM::(activateLVs) Refreshing lvs:
vg=bd616961-6da7-4eb0-939e-330b0a3fea6e lvs=['metadata', 'leases',
'ids', 'inbox', 'outbox', 'master']
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:26,974::lvm::288::Storage.Misc.excCmd::(cmd) /usr/bin/taskset
--cpu-list 0-39 /usr/bin/sudo -n /usr/sbin/lvm lvchange --config '
devices { preferred_names = ["^/dev/mapper/"] ignore_suspended_d
evices=1 write_cache_state=0 disable_after_error_count=3 filter = [
'\''a|/dev/mapper/360050768018182b6c00000000000099e|[unknown]|'\'',
'\''r|.*|'\'' ] }  global {  locking_type=1  prioritise_write_locks=1
wait_for_locks=1  use_lvmetad=
0 }  backup {  retain_min = 50  retain_days = 0 } ' --refresh
bd616961-6da7-4eb0-939e-330b0a3fea6e/metadata
bd616961-6da7-4eb0-939e-330b0a3fea6e/leases
bd616961-6da7-4eb0-939e-330b0a3fea6e/ids
bd616961-6da7-4eb0-939e-330b0a3fea6e/inbox b
d616961-6da7-4eb0-939e-330b0a3fea6e/outbox
bd616961-6da7-4eb0-939e-330b0a3fea6e/master (cwd None)
Reactor thread::INFO::2017-04-20
07:01:27,069::protocoldetector::72::ProtocolDetector.AcceptorImpl::(handle_accept)
Accepting connection from ::1:44692
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:27,070::lvm::288::Storage.Misc.excCmd::(cmd) SUCCESS: <err> = "
WARNING: Not using lvmetad because config setting use_lvmetad=0.\n
WARNING: To avoid corruption, rescan devices to make changes
 visible (pvscan --cache).\n  Couldn't find device with uuid
jDB9VW-bNqY-UIKc-XxXp-xnyK-ZTlt-7Cpa1U.\n"; <rc> = 0
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:27,070::sp::662::Storage.StoragePool::(_stopWatchingDomainsState)
Stop watching domains state
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:27,070::resourceManager::628::Storage.ResourceManager::(releaseResource)
Trying to release resource
'Storage.58493e81-01dc-01d8-0390-000000000032'
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:27,071::resourceManager::647::Storage.ResourceManager::(releaseResource)
Released resource 'Storage.58493e81-01dc-01d8-0390-000000000032' (0
active users)
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:27,071::resourceManager::653::Storage.ResourceManager::(releaseResource)
Resource 'Storage.58493e81-01dc-01d8-0390-000000000032' is free,
finding out if anyone is waiting for it.
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:27,071::resourceManager::661::Storage.ResourceManager::(releaseResource)
No one is waiting for resource
'Storage.58493e81-01dc-01d8-0390-000000000032', Clearing records.
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:27,071::resourceManager::628::Storage.ResourceManager::(releaseResource)
Trying to release resource 'Storage.HsmDomainMonitorLock'
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:27,071::resourceManager::647::Storage.ResourceManager::(releaseResource)
Released resource 'Storage.HsmDomainMonitorLock' (0 active users)
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:27,071::resourceManager::653::Storage.ResourceManager::(releaseResource)
Resource 'Storage.HsmDomainMonitorLock' is free, finding out if anyone
is waiting for it.
jsonrpc.Executor/5::DEBUG::2017-04-20
07:01:27,071::resourceManager::661::Storage.ResourceManager::(releaseResource)
No one is waiting for resource 'Storage.HsmDomainMonitorLock',
Clearing records.
jsonrpc.Executor/5::ERROR::2017-04-20
07:01:27,072::task::868::Storage.TaskManager.Task::(_setError)
Task=`15122a21-4fb7-45bf-9a9a-4b97f27bc1e1`::Unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/task.py", line 875, in _run
    return fn(*args, **kargs)
  File "/usr/lib/python2.7/site-packages/vdsm/logUtils.py", line 50, in wrapper
    res = f(*args, **kwargs)
  File "/usr/share/vdsm/storage/hsm.py", line 988, in connectStoragePool
    spUUID, hostID, msdUUID, masterVersion, domainsMap)
  File "/usr/share/vdsm/storage/hsm.py", line 1053, in _connectStoragePool
    res = pool.connect(hostID, msdUUID, masterVersion)
  File "/usr/share/vdsm/storage/sp.py", line 646, in connect
    self.__rebuild(msdUUID=msdUUID, masterVersion=masterVersion)
  File "/usr/share/vdsm/storage/sp.py", line 1219, in __rebuild
    self.setMasterDomain(msdUUID, masterVersion)
  File "/usr/share/vdsm/storage/sp.py", line 1427, in setMasterDomain
    domain = sdCache.produce(msdUUID)
  File "/usr/share/vdsm/storage/sdc.py", line 101, in produce
    domain.getRealDomain()
  File "/usr/share/vdsm/storage/sdc.py", line 53, in getRealDomain
    return self._cache._realProduce(self._sdUUID)
  File "/usr/share/vdsm/storage/sdc.py", line 125, in _realProduce
    domain = self._findDomain(sdUUID)
  File "/usr/share/vdsm/storage/sdc.py", line 144, in _findDomain
    dom = findMethod(sdUUID)
  File "/usr/share/vdsm/storage/blockSD.py", line 1441, in findDomain
    return BlockStorageDomain(BlockStorageDomain.findDomainPath(sdUUID))
  File "/usr/share/vdsm/storage/blockSD.py", line 814, in __init__
    lvm.checkVGBlockSizes(sdUUID, (self.logBlkSize, self.phyBlkSize))
  File "/usr/share/vdsm/storage/lvm.py", line 1056, in checkVGBlockSizes
    _checkpvsblksize(pvs, vgBlkSize)
 File "/usr/share/vdsm/storage/lvm.py", line 1033, in _checkpvsblksize
    pvBlkSize = _getpvblksize(pv)
  File "/usr/share/vdsm/storage/lvm.py", line 1027, in _getpvblksize
    dev = devicemapper.getDmId(os.path.basename(pv))
  File "/usr/share/vdsm/storage/devicemapper.py", line 40, in getDmId
    deviceMultipathName)
OSError: [Errno 19] Could not find dm device named `[unknown]`


Any input how to diagnose or troubleshoot would be appreciated.

-- 
Best Regards

Jens Oechsler
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