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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Yes, it needs to be a PV VM at the moment. It needs to
know the UUID of the VM that it lives in, which is why it’s looking in
/sys/hypervisor/uuid. We could add a flag to OpenStack to let you pass
this in, but there’s not really any point, because the performance with
the PV VM will be far superior to the HVM one anyway.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>To convert it, you need to install a Xen kernel (suffix -virtual
if you’re on Ubuntu), and then switch it to PV mode using the XenServer
CLI:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>UUID=$(xe vm-list --minimal name-label='Whatever you called it')<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>xe vm-param-set uuid=$UUID HVM-boot-policy=""<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>xe vm-param-set uuid=$UUID PV-bootloader=pygrub<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Before you reboot, make sure that the grub config has been set
up correctly. It needs to refer to the new kernel, obviously. Also,
the device names are going to change across the reboot – your root disk
is going to stop being /dev/sda1 (or whatever) and turn into /dev/xvda1. (An
exception to this is on Ubuntu Maverick, which uses /dev/sdX in the PV kernel
too.) Most modern installations use disk labels rather than device names these
days, so you should be OK, but it’s worth checking.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Also, there’s a bug in some versions of Pygrub such that
it will fail to boot if you have a submenu declaration in your grub.cfg.
If that’s the case (common on Ubuntu if you have upgraded your kernel at
any point) then you’ll need to remove the submenu declaration and its matching
close-brace.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>After that, reboot, and it should come up in PV mode. If
it fails to come up, set HVM-boot-policy back to ‘BIOS order’ and you
can boot back into HVM mode and figure out what went wrong.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Ewan.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> jeffrey coho
[mailto:jeffreycohobupt@gmail.com] <br>
<b>Sent:</b> 04 January 2012 06:07<br>
<b>To:</b> Ewan Mellor<br>
<b>Cc:</b> openstack@lists.launchpad.net<br>
<b>Subject:</b> Re: [Openstack] [OpenStack] OpenStack with Xen<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>Hi, <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> Does the nova-compute DomU need to be a PV
guest?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>I have it now on a HVM guest,which it is causing the
problem<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><strong> Errno 2: No such file or directory:
'/sys/hypervisor/uuid'.</strong><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>If so ,what should i do if i still want to use this HVM
without reinstalling<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>everything again on a PV guest?Thanks.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Yours,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Jeff<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>2012/1/4 Ewan Mellor <<a
href="mailto:Ewan.Mellor@eu.citrix.com">Ewan.Mellor@eu.citrix.com</a>><o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Is
this what you’re looking for?</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a
href="http://wiki.openstack.org/XenServerDevelopment" target="_blank">http://wiki.openstack.org/XenServerDevelopment</a></span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Cheers,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ewan.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
openstack-bounces+ewan.mellor=<a href="mailto:citrix.com@lists.launchpad.net"
target="_blank">citrix.com@lists.launchpad.net</a> [mailto:<a
href="mailto:openstack-bounces%2Bewan.mellor" target="_blank">openstack-bounces+ewan.mellor</a>=<a
href="mailto:citrix.com@lists.launchpad.net" target="_blank">citrix.com@lists.launchpad.net</a>]
<b>On Behalf Of </b>Guilherme Birk<br>
<b>Sent:</b> 03 January 2012 09:06<br>
<b>To:</b> Openstack Mail List<br>
<b>Subject:</b> [Openstack] [OpenStack] OpenStack with Xen</span><o:p></o:p></p>
</div>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>I've already have a
Nova configuration working with kvm. Now I want to install and configure the
Xen enviroment. Anyone can recomend any material or tutorial where I can find
how to install, configure and then integrate with OpenStack ?</span><o:p></o:p></p>
</div>
</div>
</div>
</div>
</div>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
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</div>
<p class=MsoNormal><br>
<br clear=all>
<br>
-- <br>
Sincerely yours, <o:p></o:p></p>
<div>
<p class=MsoNormal>Jeff<o:p></o:p></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
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