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Cloning bug from RHEL5 -> RHEL6

+++ This bug was initially created as a clone of Bug #593914 +++

We need the ability for a user to specify the cache mechanism used by each virtual disk device.

The user should be able to select between "no cache", "writethrough" and "writeback' where no-cache should be the default.

Created attachment 415424 [details]
Allow changing cache setting in VM Details -> Disk section

Verified with virt-manager-0.8.4-4.el6.noarch, the following options can be selected. Moving to VERIFIED.

Cache mode: default | none | writeback | writethrough

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.