Hello,
I'm experimenting to install ovirt ng node 4.2 via pxe and it seems all went ok.
Only problem I have is that opening terminal session I get this traceback that seems related to thinpool

Traceback (most recent call last):                                                                                                                          
  File "/usr/lib64/python2.7/runpy.py", line 162, in _run_module_as_main                                                                                    
    "__main__", fname, loader, pkg_name)                                                                                                                    
  File "/usr/lib64/python2.7/runpy.py", line 72, in _run_code                                                                                               
    exec code in run_globals                                                                                                                                
  File "/usr/lib/python2.7/site-packages/nodectl/__main__.py", line 42, in <module>                                                                         
    CliApplication()                                                                                                                                        
  File "/usr/lib/python2.7/site-packages/nodectl/__init__.py", line 200, in CliApplication                                                                  
    return cmdmap.command(args)                                                                                                                             
  File "/usr/lib/python2.7/site-packages/nodectl/__init__.py", line 118, in command                                                                         
    return self.commands[command](**kwargs)                                                                                                                 
  File "/usr/lib/python2.7/site-packages/nodectl/__init__.py", line 101, in motd                                                                            
    Motd(Status(Health(self.imgbased).status(),                                                                                                             
  File "/usr/lib/python2.7/site-packages/imgbased/plugins/core.py", line 358, in status                                                                     
    status.results.append(group().run())                                                                                                                    
  File "/usr/lib/python2.7/site-packages/imgbased/plugins/core.py", line 385, in check_thin                                                                 
    pool = self.app.imgbase._thinpool()                                                                                                                     
  File "/usr/lib/python2.7/site-packages/imgbased/imgbase.py", line 120, in _thinpool                                                                       
    return LVM.Thinpool.from_tag(self.thinpool_tag)                                                                                                         
  File "/usr/lib/python2.7/site-packages/imgbased/lvm.py", line 191, in from_tag                                                                            
    assert len(lvs) == 1                                                                                                                                    
AssertionError                                                                                                                                              
Admin Console: https://192.168.122.196:9090/                                                                                                                
                                                                                                                                                            
[root@localhost ~]#     

Current disk layout is

[root@localhost ~]# fdisk -l /dev/vda

Disk /dev/vda: 53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a3595

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048     2099199     1048576   83  Linux
/dev/vda2         2099200   104857599    51379200   8e  Linux LVM

[root@localhost ~]# pvs
  PV         VG     Fmt  Attr PSize   PFree
  /dev/vda2  centos lvm2 a--  <49.00g 9.80g

[root@localhost ~]# vgs
  VG     #PV #LV #SN Attr   VSize   VFree
  centos   1   3   0 wz--n- <49.00g 9.80g

[root@localhost ~]# lvs
  LV     VG     Attr       LSize   Pool   Origin Data%  Meta%  Move Log Cpy%Sync Convert
  pool00 centos twi-aotz-- <34.16g               10.28  9.18                           
  root   centos Vwi-aotz-- <34.16g pool00        10.28                                 
  swap   centos -wi-ao----   5.00g                                                     
[root@localhost ~]#

Any hint?

I installed from 4.2 iso and then applied the ovirt-node-ng-image-update-4.2.1.1-1.el7.centos.noarch yum update
The problem remains

At the moment it is not linked with any engine, also installed.
I can go to the Admin Console web page and I see, clicking inside "Virtualization" left tab, that on the right dashboard I have a yellow triangle to the right of the "Health" word...
But I don't exactly understand the source of the warning...
 
Thanks for any hint related,

Gianluca