<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> Hello, I thank you very much for sharing your knowledge with me. My VMs got defined by virt-manager with <driver name='qemu' type='raw'/> At first I'll give a try to Justin's configuration tweak and let you know what happen if I change it to <driver name='qemu' type='raw' cache='none'/> I'm also really happy to know how to dynamically add or remove an iscsi LUN from my server. Have a nice day. Gildas Le 28/10/2010 00:05, Justin Clift a écrit : <blockquote cite="mid:4CC8A225.2000703@redhat.com" type="cite"> <pre wrap="">On 10/28/2010 06:06 AM, Mark van Walraven wrote: </pre> <blockquote type="cite"> <pre wrap="">On Wed, Oct 27, 2010 at 11:10:25AM +0200, Gildas Bayard wrote: </pre> <blockquote type="cite"> <pre wrap="">My understanding is that blade A got it's iscsi disk cache up and running and that when the VM comes back, blade A has no way to know that the VM got its disk altered by its stay on blade B for a while. Hence the corruption. </pre> </blockquote> <pre wrap=""> Another possible reason is caching by KVM. Check in the <disk> element of the domain definition for one like: <driver name='qemu' cache='none'/> Without it, KVM defaults to 'writethrough' caching, which is not safe for migration. </pre> </blockquote> <pre wrap=""> Gildas, are you ok to check this setting and let us know if it helps you? This one setting seems like it's what you might need, and could be a simple fix. It *might* affect your virtual machine's performance though. (not sure) Phil's end-to-end configuration sounds really useful too, but a bit more involved to adapt if there's an easy fix. :) </pre> </blockquote> <div class="moz-signature">-- Gildas Bayard Responsable de l'équipe Assistance Informatique et Technique Laboratoire HEUDIASYC - UMR CNRS 6599 UTC Centre de Recherches de Royallieu BP 20529 - 60205 Compiègne Cedex Tél. 03 44 23 46 71 </div> </body> </html>