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Re: [Xen-users] HVM DomU boot failure with scsi disk

  • To: xen-users@xxxxxxxxxxxxx
  • From: Alexandre Kouznetsov <alk@xxxxxxxxxx>
  • Date: Mon, 19 Mar 2012 14:30:21 -0600
  • Delivery-date: Mon, 19 Mar 2012 20:31:41 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>


On 19/03/12 04:51, tangming wrote:
When I changed the disk type from "sda" to "hda", everthing works well. But I 
need the DomU
booting via sda mode because of the business demand.

Historically, Xen HVM can't emulate SCSI. Quote from http://ian.blenke.com/xen/hvm/svm/vtx/qemu (quite old, btw, 2006): "HVM hardware is emulated via a patched QEMU "device manager" (qemu-dm) daemon running as a backend in dom0. There is no SCSI emulation, only PIIX3 IDE (with some rudimentary PIIX4 capabilities), Cirrus Logic or vanilla VGA emulated video, RTL8139 or NE2000 network emulation, PAE, and somewhat limited ACPI and APIC support. Basically the same devices available in QEMU 0.8.2 today (with a number of patches for performance, etc)."

There are references of presenting the drive to HVM guest as "sda" and even "xvda", but i have never done that:

Can you see in your /var/log/xen/qemu-dm-*.log any complain about the drive naming?

What is that "business demand"? Maybe it's solvable in some different manner?

Alexandre Kouznetsov

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