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Description of problem:
Failed to add a disk to a vm by creating a new volume with Physical Disk Device pool

Version-Release number of selected component (if applicable):
cockpit-machines-197-1.el8.noarch
libvirt-dbus-1.2.0-2.module+el8.1.0+2983+b2ae9c0a.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Prepare a Physical Disk Device pool: pdd-pool and add it in the Storage Pools, format as msdos.
2. Prepare a VM, open the Disks tab, click Add Disk and configure options as following:
Source: Create New
Pool: pdd-pool
Name: test
Size: 1 GiB
3. Click Add 


Actual results:
Error occurs:
Disk failed to be created
Error message: unsupported configuration: unknown volume format type undefined

Expected results:
Disk can be created successfully.

Additional info:

https://github.com/cockpit-project/cockpit/pull/12457

Verified with package:
cockpit-machines-197.2-1.el8.noarch

Steps:
1. Prepare a Physical Disk Device pool: pdd-pool and add it in the Storage Pools, format as msdos.
2. Prepare a VM, open the Disks tab, click Add Disk and configure options as following:
Source: Create New
Pool: pdd-pool
Name: sdb1
Size: 1 GiB
3. Click Add 

Disk can be added correctly, so verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:3325