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b855f8ea1e
Qemu 8.1.0 will add discard_no_unref option for qcow2 images. When this option is enabled (default=false), then it will no longer unreference clusters when guest does a discard, but it will just free the blocks (useful for incremental backups for example) and pass the discard to the lower layer. This was implemented to avoid fragmentation within the qcow2 image. Signed-off-by: Jean-Louis Dupond <jean-louis@dupond.be> Reviewed-by: Peter Krempa <pkrempa@redhat.com> Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
33 lines
1.1 KiB
XML
33 lines
1.1 KiB
XML
<domain type='qemu'>
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<name>test</name>
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<uuid>92d7a226-cfae-425b-a6d3-00bbf9ec5c9e</uuid>
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<memory unit='KiB'>1048576</memory>
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<currentMemory unit='KiB'>1048576</currentMemory>
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<vcpu placement='static'>1</vcpu>
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<os>
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<type arch='x86_64' machine='pc'>hvm</type>
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<boot dev='cdrom'/>
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<boot dev='hd'/>
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<bootmenu enable='yes'/>
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</os>
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<clock offset='utc'/>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>restart</on_crash>
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<devices>
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<emulator>/usr/bin/qemu-system-x86_64</emulator>
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<!-- For this disk, intentionally stress parser resilience to
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atypical ordering -->
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<disk device='disk'>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
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<source file='/var/lib/libvirt/images/f14.img'/>
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<target dev='vda' bus='virtio'/>
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<driver discard='unmap' discard_no_unref='on' name='qemu' type='qcow2'/>
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</disk>
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<controller type='usb' index='0'/>
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<controller type='ide' index='0'/>
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<controller type='pci' index='0' model='pci-root'/>
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<memballoon model='virtio'/>
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</devices>
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</domain>
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