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For better performance allows enabling the virtio-scsi model on the scsi controller in VM's. Additionally supports inferring use of virtio-scsi model from disk device or bus, and similarly infer the correct values for these based on device or bus. Currently one controller per 7 domain volume disks is created, this follows virt-manager's behaviour, and is assumed a reasonable default. However note that virtio-scsi should be capable of allowing many more disks to be assigned per controller than this. It is presumed that the source of the number 7 is allowing for 8 devices per controller including the host adapter, which therefore allows for 7. Hardware SCSI controllers typically supported 16 addressable devices including the adapter providing for a 15 disk limit. Whether this is necessary is not yet clear. Co-authored-by: Darragh Bailey <daragh.bailey@gmail.com>
45 lines
1.1 KiB
XML
45 lines
1.1 KiB
XML
<domain type='' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
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<name></name>
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<title></title>
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<description></description>
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<uuid></uuid>
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<memory></memory>
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<vcpu>1</vcpu>
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<cpu mode='host-model'>
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<model fallback='allow'></model>
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</cpu>
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<os>
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<type>hvm</type>
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<kernel></kernel>
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<initrd></initrd>
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<cmdline></cmdline>
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</os>
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<features>
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<acpi/>
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<apic/>
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<pae/>
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</features>
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<clock offset='utc'>
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</clock>
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<devices>
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<disk type='file' device='disk'>
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<alias name='ua-box-volume-0'/>
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<driver name='qemu' type='qcow2' cache='unsafe'/>
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<source file='/var/lib/libvirt/images/test.qcow2'/>
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<target dev='vda' bus='scsi'/>
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</disk>
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<controller type='scsi' model='virtio-scsi' index='0'/>
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<serial type='pty'>
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<target port='0'/>
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</serial>
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<console type='pty'>
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<target port='0'/>
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</console>
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<input type='mouse' bus='ps2'/>
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<graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1' keymap='en-us'/>
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<video>
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<model type='cirrus' vram='16384' heads='1'/>
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</video>
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</devices>
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</domain>
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