====== 05 ゲストCentOS5をVirtio化 ======

virtioを使ったほうが早い


===== １．先にゲストでvirtioを組み込み =====
virtioドライバを入れたinitrdを用意しておく
<code>
root# cd /boot
root# cp -p initrd-$(uname -r).img initrd-$(uname -r)_ide.img
root# mkinitrd -v -f --with=virtio_pci --with=virtio_blk initrd-$(uname -r).img  $(uname -r)
</code>



===== ２．起動ファイル修正 =====
  # virsh edit [VM]

===== Disk =====

target dev をvda へ、busをvirtioに変更
  <disk type='block' device='disk'>
   <driver name='qemu' type='raw' cache='none' io='native'/>
   <source dev='/dev/mapper/VolG00-Volmatsui'/>
   <target dev='hda' bus='ide'/>
  </disk>
   ↓ ↓ 変更
  <disk type='block' device='disk'>
    <driver name='qemu' type='raw' cache='none' io='native'/>
    <source dev='/dev/mapper/VolG00-Volmatsui'/>
    <target dev='vda' bus='virtio'/>
  </disk>

===== NIC =====
「<model type='virtio'/>」を追加

  <interface type='bridge'>
    <mac address='52:54:00:ff:92:5e'/>
    <source bridge='br1'/>
    <target dev='vnet1'/>
    <alias name='net1'/>
    <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
  </interface>
  ↓ ↓ 追加
  <interface type='bridge'>
    <mac address='52:54:00:ff:92:5e'/>
    <source bridge='br1'/>
    <target dev='vnet1'/>
    <model type='virtio'/>
    <alias name='net1'/>
    <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
  </interface>
{{tag>kvm}}