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Created attachment 431116 [details]
screenshot

Description of problem:
When I create new volume from LVM Volume Group, I cannot select qcow2 format and the format item is grey, the default is 'raw'.

Version-Release number of selected component (if applicable):
Virtual Machine Manager 0.8.4


How reproducible:
100%

Steps to Reproduce:
1. Add LVM Volume Group in host
   go to Edit -> Host Details -> Storage -> Add Pool
   input 'Name' and 'Type' ->logical:LVM Volume Group; add 'Target path' then finished.
2. Create New volume
   go to Edit -> Host Details -> Storage -> LVM Volume Group, press New Volume button, 
  
Actual results:
the 'Format' item is grey, cannot select the qcow2 format from this item.

Expected results:
can select qcow2 format

Additional info:

This issue has been proposed when we are only considering blocker
issues in the current Red Hat Enterprise Linux release. It has
been denied for the current Red Hat Enterprise Linux release.

** If you would still like this issue considered for the current
release, ask your support representative to file as a blocker on
your behalf. Otherwise ask that it be considered for the next
Red Hat Enterprise Linux release. **

This is actually a limitation at the libvirt level. Reassigning

Since RHEL 6.1 External Beta has begun, and this bug remains 
unresolved, it has been rejected as it is not proposed as an 
exception or blocker.

Red Hat invites you to ask your support representative to 
propose this request, if appropriate and relevant, in the 
next release of Red Hat Enterprise Linux.