ubuntu 8.04 KVM 中更换 cdrom iso文件

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　　1. 启动kvm后,进入 monitor 模式 alt+ctl+2 返回 alt+ctl+1
　　
　　2. 进入后 help
　　
　　cdrom 的 device名为:ide1-cd0 而不是cdrom 了.
　　
　　"the naming of certain block devices has changed in the newer qemu
  releases (for example, cdrom has been changed to ide1-cd0)."
　　Test VM is started by virt-manager using kvm with option -cdrom /path/cd1.iso .
　　Now in virsh:
virsh # attach-disk 1 /path/cd2.iso hdc --type cdrom
(nothing happens)
　　.libvirt/qemu/log/testvm.log says:
  change cdrom "/path/cd2.iso"
　　device not found
　　That's because cdrom device name in kvm/qemu now is ide1-cd0.
　　This is on current hardy.