Gordan Bobic wrote:
Lastly, do you use cache=wb on qemu? it's just a fun mode, we use
cache=off only.
I don't see the option being set in the logs, so I'd guess it's whatever
qemu-kvm defaults to.
You can set this through libvirt by putting an element such as the
following within your <disk> element:
<driver name='qemu' type='qcow2' cache='none'/>
(Setting the type is preferred to avoid security issues wherein a guest
writes an arbitrary qcow2 header to the beginning of a raw disk, reboots
and allows qemu's autodetection to decide that this formerly-raw disk
should now be treated as a delta against a file they otherwise might not
have access to read; as such, it's particularly important if you intend
that the type be raw).
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