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RE: [Xen-users] HVM XVDA or HDA ?

  • To: "Nicolas Vilz" <niv@xxxxxxxxxx>
  • From: "Ian Tobin" <itobin@xxxxxxxxxxxxx>
  • Date: Thu, 8 Sep 2011 19:32:20 +0100
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 08 Sep 2011 11:33:28 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcxuS9SmhVac238uTP2YypCxPYnCwAACZWFA
  • Thread-topic: [Xen-users] HVM XVDA or HDA ?


Sorry im not quite following.  I have just set xvda in my file config
and windows boots ok.  I read in another post that using xvda with pv
drivers offers performance increase?

When you say bios emulation, do you mean the hvm loader bios?



-----Original Message-----
From: Nicolas Vilz [mailto:niv@xxxxxxxxxx] 
Sent: 08 September 2011 18:22
To: Ian Tobin
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] HVM XVDA or HDA ?

On Wed, 7 Sep 2011, Ian Tobin wrote:

> Hi,
> Im trying to get my head round the use of XVDA in the domU config
> Should we be using that or continue to use hda? Is there any
performance increase in using XVDA? 
> We have a few Windows 2008 HVMs so should we switch the the new disk
config?  We are using LVM and file based images by the way.

You will need hda for hvm on dom0 side for the bios emulation. In later
kernels on domU side (2.6.38+) you will need hda on dom0 side (in
xmconfig.cfg) and xvda on domU side (in fstab) or simply uuids to get

That doesnt affect your win2008 HVMs, of course, but as i said, you will
need hda for bios emulation.


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