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Subject svn commit: r1370641 - /incubator/tashi/trunk/doc/INSTALL2
Date Wed, 08 Aug 2012 02:34:06 GMT
Author: stroucki
Date: Wed Aug  8 02:34:05 2012
New Revision: 1370641

INSTALL2: Note Qemu version incompatibilities, and the risk for migrations


Modified: incubator/tashi/trunk/doc/INSTALL2
--- incubator/tashi/trunk/doc/INSTALL2 (original)
+++ incubator/tashi/trunk/doc/INSTALL2 Wed Aug  8 02:34:05 2012
@@ -22,6 +22,15 @@ should be chosen so that there is always
 accounting data. Otherwise, this could lead to VMs running but not known 
 to the nodemanager.
+If you are using Qemu/KVM as the hypervisor, be advised that the VM 
+format changes rather quickly. E.g. version 1.1 of Qemu states it will 
+accept migrations in from versions 0.13 to 1.1. Migrations out are 
+liable to be dropped on the floor by a receiving older version Qemu 
+(with a successful return from the sending Qemu). Be careful to only 
+deploy Qemu versions in your cluster that can work together. Since 
+suspend and resume are handled via the same mechanisms, the above caveat 
+applies to these actions too.
 ---+ Deployment over multiple networks
 To add additional networks to the Apache Tashi cluster, they should be 

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