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docs: formatdomain: Mention the QEMU requirement for discard_no_unref

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Signed-off-by: Han Han <hhan@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
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Han Han 2023-07-26 11:11:39 +08:00 committed by Martin Kletzander
parent 3d9e35b837
commit 0cec8abdba
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docs/formatdomain.rst
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@ -3296,7 +3296,8 @@ paravirtualized driver is specified via the ``disk`` element.
image. When enabled, a discard request from within the guest will mark the
qcow2 cluster as zero, but will keep the reference/offset of that cluster.
But it will still pass the discard further to the lower layer.
This will resolve fragmentation within the qcow2 image. :since:`Since 9.5.0`
This will resolve fragmentation within the qcow2 image. :since:`Since 9.5.0
(QEMU 8.1)`
In the majority of cases the default configuration used by the hypervisor
is sufficient so modifying this setting should not be necessary. For