[Xen-users] Xen How to pass the whole physical hard disk (raw disk) to vm

[Guangning YU <yugn@xxxxxx>]

Hi, 

I recently started my project to build a home server using Xen. The idea is that one vm runs openmediavault (debian) for NAS and another vm runs Win7 (with gnu passthrough) for media player.

I managed to passthrough two WD 3TB disk (full of media files, one GPT partition, no boot) to the NAS vm. But I couldn’t find a working solution.

I searched the net and find the following using libvirt. Libvirt works quite well in my system. And I hardly have any problem to create vm while xm toolstack gave me a lot of trouble.

=== hard disks to be passed as raw ===

/dev/sda is for WD3TB01 (ext4)

/dev/sdb is for WD3TB02 (ext4)

Here is the part of the NAS-OMV.xml to define a HVM windows to passthrough two hard disks. I updated the vm using 

EDIT=nano virsh edit NAS-OMV

And I entered the following

<disk type='block' device='disk'>

  <driver name='qemu' type='raw'/>

  <source dev='/dev/sda'/>

  <target dev=‘hdb' bus='virtio'/>

</disk>

<disk type='block' device='disk'>

  <driver name='qemu' type='raw'/>

  <source dev='/dev/sdb'/>

  <target dev=‘hdc' bus='virtio'/>

</disk>

Error after “virsh start NAS-OMV”

error: Failed to start domain NAS-OMV

error: POST operation failed: xend_post: error from xen daemon: (xend.err 'Block device type "qemu" is invalid.’)

virsh dumpxml NAS-OMV  (Note: libvirt would examine the grammar and change accordingly. See the text in red after virsh edit.)

<domain type='xen'>

  <name>NAS-OMV</name>

  <uuid>d20932ff-51cb-ecc5-989d-4f76a8d665d9</uuid>

  <memory unit='KiB'>1048576</memory>

  <currentMemory unit='KiB'>1048576</currentMemory>

  <vcpu placement='static'>2</vcpu>

  <os>

    <type>hvm</type>

    <loader>/usr/lib/xen-4.1/boot/hvmloader</loader>

    <boot dev='hd'/>

  </os>

  <features>

    <acpi/>

    <apic/>

    <pae/>

  </features>

  <clock offset='variable' adjustment='0' basis='utc'>

    <timer name='hpet' present='no'/>

  </clock>

  <on_poweroff>destroy</on_poweroff>

  <on_reboot>restart</on_reboot>

  <on_crash>restart</on_crash>

  <devices>

    <emulator>/usr/lib/xen-4.1/bin/qemu-dm</emulator>

    <disk type='file' device='disk'>

      <driver name='file'/>

      <source file='/etc/xen/images/NAS-OMV.img'/>

      <target dev='hda' bus='ide'/>

    </disk>

    <disk type='file' device='cdrom'>

      <target dev='hde' bus='ide'/>

      <readonly/>

    </disk>

    <disk type='block' device='disk'>

      <driver name='qemu'/>

      <source dev='/dev/sda'/>

      <target dev='hdb' bus='ide'/>

    </disk>

    <disk type='block' device='disk'>

      <driver name='qemu'/>

      <source dev='/dev/sdb'/>

      <target dev='hdc' bus='ide'/>

    </disk>

    <interface type='bridge'>

      <mac address='00:16:3e:d5:5b:9a'/>

      <source bridge='xenbr1'/>

      <script path='/etc/xen/scripts/vif-bridge'/>

      <model type='e1000'/>

    </interface>

    <serial type='pty'>

      <target port='0'/>

    </serial>

    <console type='pty'>

      <target type='serial' port='0'/>

    </console>

    <input type='tablet' bus='usb'/>

    <input type='mouse' bus='ps2'/>

    <graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/>

  </devices>

</domain>

Could anyone point me to the right direction? I have to use whole physical disk passthrough to NAS vm because I don’t want to change my disk content (it is total > 4TB content). 

Thanks in advance!!

Jason

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