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Re: [Qemu-devel] [Xen-devel] Question about scsi emulation

From: Juergen Gross
Subject: Re: [Qemu-devel] [Xen-devel] Question about scsi emulation
Date: Tue, 24 Mar 2015 10:56:58 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 03/24/2015 01:20 AM, Yaoli Zheng wrote:
Thank you for the advice!
It will be grateful if someone can provide any guide how to config  MegaSAS HBA 
or how to use xen pvscsi in XEN.
There seems no option in XEN for these two driver emulation and no document 
found online.

The pvscsi driver is rather new in the Linux kernel. Support for pvscsi
in Xen tools (xl) is just being worked on:




-----Original Message-----
From: Stefano Stabellini [mailto:address@hidden
Sent: Monday, March 23, 2015 11:18 AM
To: Stefan Hajnoczi
Cc: Yaoli Zheng; address@hidden; address@hidden
Subject: Re: [Xen-devel] [Qemu-devel] Question about scsi emulation

On Mon, 23 Mar 2015, Stefan Hajnoczi wrote:
On Wed, Mar 18, 2015 at 02:16:47PM -0700, Yaoli Zheng wrote:
We have problem using qemu emulated scsi driver(the old lsi). Wonder if any of 
other device model we can try for emulating scsi, and how we can get and config 
it in Xen? Having been told virtio-scsi is alternative one, but have no idea 
how to get it work in Xen.

The MegaSAS HBA might be another option.  Not sure whether MegaSAS or
virtio-scsi are supported under Xen though.

Making MegaSAS HBA work on Xen should be easy.

Rather than virtio-scsi I would consider the new Xen pvscsi frontend/backend 
drivers, now upstream in Linux (drivers/scsi/xen-scsifront.c and 
drivers/xen/xen-scsiback.c). Usually Xen PV drivers perform much better than 
virtio devices on Xen.

That said, probably most things would be better than the old lsi.

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