Hello,
f18 server with oVirt engine
 ovirt-engine-3.2.0-1.20130113.gitc954518.fc18.noarch

and f18 host
with
vdsm-4.10.3-0.78.gitb005b54.fc18.x86_64

DC is configred wth FCP as default.
Trying to add a LUN  I get
Error while executing action New SAN Storage Domain: Error creating a storage domain

I notice hat it creates PV and VG
pvs:
  /dev/mapper/3600507630efe05800000000000001601 c6bb44ee-b824-44a0-a62c-f537a23d2e2b lvm2 a--  99.62g 99.62g

vgs:
  VG                                   #PV #LV #SN Attr   VSize  VFree 
  c6bb44ee-b824-44a0-a62c-f537a23d2e2b   1   0   0 wz--n- 99.62g 99.62g

vdsm.log
Thread-26641::DEBUG::2013-01-16 00:34:15,073::lvm::359::OperationMutex::(_reloadpvs) Operation 'lvm reload operation' released the operation mutex
Thread-26641::WARNING::2013-01-16 00:34:15,073::lvm::73::Storage.LVM::(__getattr__) /dev/mapper/3600507630efe05800000000000001601 can't be reloaded, please check your storage connections.
Thread-26641::ERROR::2013-01-16 00:34:15,073::task::833::TaskManager.Task::(_setError) Task=`1dea04e7-56e1-49c3-a702-efa676ef1e7e`::Unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/task.py", line 840, in _run
    return fn(*args, **kargs)
  File "/usr/share/vdsm/logUtils.py", line 42, in wrapper
    res = f(*args, **kwargs)
  File "/usr/share/vdsm/storage/hsm.py", line 2424, in createStorageDomain
    domVersion)
  File "/usr/share/vdsm/storage/blockSD.py", line 505, in create
    numOfPVs = len(lvm.listPVNames(vgName))
  File "/usr/share/vdsm/storage/lvm.py", line 1257, in listPVNames
    return [pv.name for pv in pvs if pv.vg_name == vgName]
  File "/usr/share/vdsm/storage/lvm.py", line 74, in __getattr__
    raise AttributeError("Failed reload: %s" % self.name)
AttributeError: Failed reload: /dev/mapper/3600507630efe05800000000000001601
Thread-26641::DEBUG::2013-01-16 00:34:15,074::task::852::TaskManager.Task::(_run) Task=`1dea04e7-56e1-49c3-a702-efa676ef1e7e`::Task._run: 1dea04e7-56e1-49c3-a702-efa676ef1e7e (2, 'c6bb44ee-b824-44a0-a62c-f537a23d2e2b', '3600507630efe05800000000000001601', 'x3XSZx-avUC-0NNI-w5K4-nCOp-uxp5-TD9GvH', 1, '3') {} failed - stopping task
Thread-26641::DEBUG::2013-01-16 00:34:15,074::task::1177::TaskManager.Task::(stop) Task=`1dea04e7-56e1-49c3-a702-efa676ef1e7e`::stopping in state preparing (force False)
Thread-26641::DEBUG::2013-01-16 00:34:15,074::task::957::TaskManager.Task::(_decref) Task=`1dea04e7-56e1-49c3-a702-efa676ef1e7e`::ref 1 aborting True

In messages:
Jan 16 00:34:14 f18ovn03 vdsm Storage.LVM WARNING lvm vgs failed: 5 ['  x3XSZx-avUC-0NNI-w5K4-nCOp-uxp5-TD9GvH|c6bb44ee-b824-44a0-a62c-f537a23d2e2b|wz--n-|106971529216|106971529216|134217728|797|797|RHAT_storage_domain_UNREADY|134217728|67107328'] ['  Skipping clustered volume group VG_VIRT04', '  Skipping clustered volume group VG_VIRT02', '  Skipping clustered volume group VG_VIRT03', '  Skipping clustered volume group VG_VIRT01']
Jan 16 00:34:15 f18ovn03 vdsm Storage.LVM WARNING lvm pvs failed: 5 ['  NQRb0Q-3C0k-3RRo-1LZZ-NNy2-42A1-c7zO8e|/dev/mapper/3600507630efe05800000000000001601|106971529216|c6bb44ee-b824-44a0-a62c-f537a23d2e2b|x3XSZx-avUC-0NNI-w5K4-nCOp-uxp5-TD9GvH|135266304|797|0|2|107374182400'] ['  Skipping clustered volume group VG_VIRT04', '  Skipping volume group VG_VIRT04', '  Skipping clustered volume group VG_VIRT02', '  Skipping volume group VG_VIRT02', '  Skipping clustered volume group VG_VIRT03', '  Skipping volume group VG_VIRT03', '  Skipping clustered volume group VG_VIRT03', '  Skipping volume group VG_VIRT03', '  Skipping clustered volume group VG_VIRT01', '  Skipping volume group VG_VIRT01', '  Skipping clustered volume group VG_VIRT01', '  Skipping volume group VG_VIRT01']
Jan 16 00:34:15 f18ovn03 vdsm Storage.LVM WARNING /dev/mapper/3600507630efe05800000000000001601 can't be reloaded, please check your storage connections.
Jan 16 00:34:15 f18ovn03 vdsm TaskManager.Task ERROR Task=`1dea04e7-56e1-49c3-a702-efa676ef1e7e`::Unexpected error
Jan 16 00:34:15 f18ovn03 vdsm Storage.Dispatcher.Protect ERROR Failed reload: /dev/mapper/3600507630efe05800000000000001601

Can it be that the clustered VGs on other LUNs that are skipped is the cause?

BTW: tomorrow I should have a SAN guy able to mask them ...
Gianluca