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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>
43 lines
1.5 KiB
XML
43 lines
1.5 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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<cpu mode='custom' match='exact' check='none'>
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<model fallback='forbid'>qemu64</model>
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</cpu>
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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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<disk type='file' device='disk'>
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<driver name='qemu' type='qcow2' discard='unmap' discard_no_unref='on'/>
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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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<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
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</disk>
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<controller type='usb' index='0' model='piix3-uhci'>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
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</controller>
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<controller type='ide' index='0'>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
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</controller>
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<controller type='pci' index='0' model='pci-root'/>
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<input type='mouse' bus='ps2'/>
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<input type='keyboard' bus='ps2'/>
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<audio id='1' type='none'/>
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<memballoon model='virtio'>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
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</memballoon>
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</devices>
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</domain>
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