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Date: Mon, 27 Jan 2014 15:06:10 +0100
From: Stefan Hajnoczi <stefanha@gmail.com>
Message-ID: <20140127140610.GA23841@stefanha-thinkpad.redhat.com>
References: <F3FF02E5B1A52F44A89CA6A3523CE5577184EB0D@szxema507-mbx.china.huawei.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>
Cc: Paolo Bonzini <pbonzini@redhat.com>, "Luohao (brian)" <brian.luohao@huawei.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Xujunxi <xujunxi@huawei.com>

On Mon, Jan 27, 2014 at 02:50:04AM +0000, Qixiaozhen wrote:
> A instance was created by virsh command in the CentOS 6.4.
> 
> The LUN in the Storage Array Network(SAN) was attached to the instance with the following xml.
> 
>     <disk type='block' device='lun'>
>       <driver name='qemu' type='raw' cache='none'/>
>       <source dev='/dev/mapper/360022a110000ecba5db427db00000023'/>
>       <target dev='vdb' bus='virtio'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
> </disk>
> <controller type='scsi' model='virtio-scsi'/>
> 
> 
> A scsi report command was executed in the instance, for example "sg_luns /dev/vdb". However, It returned the list of the Luns in the SAN.
> 
> 
> 1)       The unrelated luns in the SAN were not isolated in the instance.
> [root@localhost ~]# sg_luns /dev/vdb
> Lun list length = 80 which imples 10 lun entries
> Report luns [select_report=0]:
>     0000000000000000
>    0001000000000000
>     0002000000000000
>     0003000000000000
>     0004000000000000
>     0005000000000000
>     0006000000000000
>     0007000000000000
>     0008000000000000
>     0009000000000000

You are using virtio-blk with SCSI-passthrough, not virtio-scsi (it's
confusing but libvirt type='block' device='lun' means virtio-blk).  This
feature has fallen out of favor and is generally best replaced with
virtio-scsi instead of virtio-blk.

If you do not require raw SCSI commands from the guest, then change
device='lun' to device='disk'.

What exactly are you trying to do?

Stefan