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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 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. 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. 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 In the majority of cases the default configuration used by the hypervisor
is sufficient so modifying this setting should not be necessary. For is sufficient so modifying this setting should not be necessary. For