Description of problem:
If some available disk (without lock icon) is chosen and then it is clicked on 'Create Brick', the Create Brick pop-up window is shown. However which disk will be really used could be changed without any problem in that window and the brick will be created.
When something similar is done for disk with lock icon the Create Brick pop-up window with available disk/partition table is shown however the creation always ends with error, regardless which of those available disks/partitions were chosen. Only indication that something is wrong is the Size value.

Version-Release number of selected component (if applicable):
ovirt-engine-3.6.0-0.0

How reproducible:
100%

Steps to Reproduce:
1. Go to 'Storage Devices' tab
2. Select some disk/partition with lock icon
3. Click on 'Create Brick' fill the form and try to create it

Actual results:
Create Brick pop-up window is shown without any error, but any brick cannot be created

Expected results:
The pop-up 'Create Brick' window will not be shown or the disk/partition where the brick should be created will be the one from the window the same behaviour as no disk/partition is selected.

Additional info:


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Description of problem:


Version-Release number of selected component (if applicable):


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Actual results:


Expected results:


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