Created attachment 787953 [details]
logs

Description of problem:
related to this new 3.3 feature:
https://bugzilla.redhat.com/show_bug.cgi?id=773427

I tried to scan alignment a disk that has been partitioned.
This action is failing every time because vdsm is unable to deactivate the volume


Version-Release number of selected component (if applicable):
vdsm-4.12.0-61.git8178ec2.el6ev.x86_64

How reproducible:
100%

Steps to Reproduce:
On a block pool:
- create a vm and run it with OS and guest-agent installed.
- add a new 3 GB disk and plug it to the vm.
- create a partition on the disk that starts from the 2048 sector with fdisk (need to change the units to sectors)
- scan alignment (on UI - under disk sub-tab, under VMs main tab - right click on the disk - 'scan alignment'

Actual results:
vdsm fails in lvchange (deactivate lv):

:
Thread-36873::ERROR::2013-08-19 11:19:21,416::task::850::TaskManager.Task::(_setError) Task=`d91d258d-e546-4af0-ae20-b5910d581072`::Unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/task.py", line 857, in _run
    return fn(*args, **kargs)
  File "/usr/share/vdsm/logUtils.py", line 45, in wrapper
    res = f(*args, **kwargs)
  File "/usr/share/vdsm/storage/hsm.py", line 3270, in teardownImage
    dom.deactivateImage(imgUUID)
  File "/usr/share/vdsm/storage/blockSD.py", line 998, in deactivateImage
    lvm.deactivateLVs(self.sdUUID, volUUIDs)
  File "/usr/share/vdsm/storage/lvm.py", line 1129, in deactivateLVs
    _setLVAvailability(vgName, toDeactivate, "n")
  File "/usr/share/vdsm/storage/lvm.py", line 784, in _setLVAvailability
    raise error(str(e))
CannotDeactivateLogicalVolume: Cannot deactivate Logical Volume: ('General Storage Exception: ("5 [] [\'  device-mapper: remove ioctl on  failed: Device or resource busy\

and vdsm is unable to scan guest alignment

Expected results:
This volume is activated so I'm not sure about the expected results.

Additional info:
logs