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Description of problem:
Allow Performance options such as directsync, writeback, writethrough to disks in cockpit GUI.

Version-Release number of selected component (if applicable):
cockpit-185-2.el8.x86_64
cockpit-machines-184.1-1.el8.noarch

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:
Such options are not there at present.

Expected results:
Such options have been present earlier in previous GUI based applications such as virt-manager.

Additional info:

commit 8da72535f8937f42702804306b4091ca3f4b036a
Author: Katerina Koukiou <kkoukiou>
Date:   Tue May 21 15:19:56 2019 +0200

    machines: add option to change disk cache mechanism when adding new disks


$ git describe 8da72535f8937f42702804306b4091ca3f4b036a
194-80-g8da72535f

Test Versions:
cockpit-machines-196-1.el8.noarch
libvirt-dbus-1.2.0-2.module+el8.1.0+2983+b2ae9c0a.x86_64


Test Steps:
1.Prepare a VM
2.Add disk for the VM with choosing one of the performance options
3.Check it by 'virsh dumpxml ${vm} | grep volume'
4.Repeat the step 2 and 3, in order to choose test all the performance options

Test Results:
1. The disk can be added correctly, and the result by using 'virsh dumpxml ${vm} | grep volume' is the same as the page


According to the results, move the status to 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