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Date: Mon, 27 Jan 2014 13:42:35 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [Qemu/Virtio-scsi]The feature of 'raw device
 mapping' cannot isolate the LUN to the owning virtual machine
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To: Qixiaozhen <qixiaozhen@huawei.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Cc: "Luohao (brian)" <brian.luohao@huawei.com>, Xujunxi <xujunxi@huawei.com>

Il 27/01/2014 13:22, Qixiaozhen ha scritto:
>     <!-- #############Raw Device Mapping with virtio-scsi################## -->
>     <disk type='block' device='lun'>
>       <driver name='qemu' type='raw' cache='none'/>
>       <source dev='/dev/mapper/360022a110000ecba5db427db00000023'/>
>       <target dev='vdb' bus='virtio'/>
>       <alias name='virtio-disk1'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
>     </disk>

This is not using virtio-scsi.

A virtio-scsi disk would appear as /devs/sda in the VM.  For example:

     <disk type='block' device='lun'>
       <driver name='qemu' type='raw' cache='none'/>
       <source dev='/dev/mapper/360022a110000ecba5db427db00000023'/>
       <target dev='sdb' bus='scsi'/>
       <address type='drive' controller='0' bus='0'/>
     </disk>

     <disk type='block' device='disk'>
       <driver name='qemu' type='raw' cache='none'/>
       <source dev='/dev/mapper/360022a110000ecba5db4074800000022'/>
       <target dev='sda' bus='scsi'/>
       <address type='drive' controller='0' bus='1'/>
     </disk>

     <controller type='scsi' index='0' model='virtio-scsi'/>

You can now try sg_inq for both disks.  One will show your NAS's product 
and vendor names, the other will show QEMU as vendor and QEMU HARD DISK 
as product.

Paolo