linux-kernel - Re: Pe: [PATCH v5 1/3] virtio-scsi: first version

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Date:	Thu, 9 Feb 2012 13:18:21 +0100
From:	Christian Hoff <christian.hoff@...ibm.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	BORNTRAE@...ux.vnet.ibm.com,
	James Bottomley <JBottomley@...allels.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, mst@...hat.com, rusty@...tcorp.com.au
Subject: Re: Pe: [PATCH v5 1/3] virtio-scsi: first version

Paolo Bonzini wrote:
> James, will you include virtio-scsi in 3.4?

The key arguments from my side for inclusion of virtio-scsi are:
- Support for SCSI multipathing, which can optionally be done on the host 
operating system.
- We can now use other SCSI(non-block) devices and make them accessible to 
the guest. For example we were able to virtualize a SCSI FCP tape using 
virtio-scsi. One of the biggest constraints of virtio-block is that it is 
limited to block devices, while virtio-scsi presents you with a more 
generic solution.

So I consider virtio-scsi to be the cleaner approach to do virtualization 
of SCSI commands. This is supported by the fact that virtio-block has a 
maintenance problem and has to change its protocol from time to time to 
support new features introduced by a new version of the SCSI standard.

So please consider including virtio-scsi into the mainline kernel tree. 
This is good and conceptually clean code, and it has proven to work very 
well in our internal testing.

Mit freundlichen Grüßen / Kind regards

Christian Hoff

Student - Applied Computer Science

Phone:
49-16098976-950
 IBM Deutschland

E-Mail:
christian.hoff@...ibm.com
 Am Fichtenberg 1

 71083 Herrenberg

 Germany

IBM Deutschland GmbH / Vorsitzender des Aufsichtsrats: Martin Jetter
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