INSTALL2: Note Qemu version incompatibilities, and the risk for migrations
git-svn-id: https://svn.apache.org/repos/asf/incubator/tashi/trunk@1370641 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/doc/INSTALL2 b/doc/INSTALL2
index a53a945..2296025 100644
--- a/doc/INSTALL2
+++ b/doc/INSTALL2
@@ -22,6 +22,15 @@
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
