I've seen something similar with KVM when using CLVM backed storage. The issue was libvirtd was restarted and didn't have any of the storage UUIDs populated. Restarting the CS Agent repopulated these. I'm not sure how XEN handles the storage side, or what kind of storage you're using, but I thought I'd mention this in case it helps at all.
- Si ________________________________________ From: Francois Gaudreault <fgaudrea...@cloudops.com> Sent: Thursday, November 13, 2014 1:24 PM To: dev@cloudstack.apache.org Subject: uuid was invalid Hi, We had some issues with one of our cluster SR, and since then, ACS goes crazy. Any ideas how to fix this? 2014-11-13 14:22:54,307 WARN [c.c.h.x.r.CitrixResourceBase] (DirectAgent-340:ctx-1a22d5c2) Catch Exception: class com.xensource.xenapi.Types$UuidInvalid due to The uuid you supplied was invalid. The uuid you supplied was invalid. at com.xensource.xenapi.Types.checkResponse(Types.java:1482) at com.xensource.xenapi.Connection.dispatch(Connection.java:350) at com.cloud.hypervisor.xen.resource.XenServerConnectionPool$XenServerConnection.dispatch(XenServerConnectionPool.java:456) at com.xensource.xenapi.VDI.getByUuid(VDI.java:326) at com.cloud.hypervisor.xen.resource.CitrixResourceBase.mount(CitrixResourceBase.java:1224) -- Francois Gaudreault Gestionnaire de Produit | Product Manager - Cloud Platform & Services t:514-629-6775 CloudOps Votre partenaire infonuagique | Cloud Solutions Experts 420 rue Guy | Montreal | Quebec | H3J 1S6 w: cloudops.com | tw: @CloudOps_