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[Xen-users] XCP 0.5.0 bug, XCCS impact

To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, Dave Scott <Dave.Scott@xxxxxxxxxxxxx>
Subject: [Xen-users] XCP 0.5.0 bug, XCCS impact
From: Vern Burke <vburke@xxxxxxxx>
Date: Mon, 30 Aug 2010 14:30:29 -0400
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Greetings all:
   Just ran into an ugly bug in XCP 0.5.0. The scenario is this:

Host 1, host 2, host 3 in the pool.

We're attempting to host-evacuate host-2.

Host 1 is out of memory (possible-hosts on a running VM on host 2 only shows host 2 and host 3)

xe host-get-vms-which-prevent-evacuation returns the uuids of all the VMs on host 2.

Attempting to host-evacuate host 2 returns "host out of memory".

In summary, XCP host-evacuate will refuse to evacuate host 2 if host 1 is out of memory, even when host 3 has plenty of memory and XCP shows that host 2's VMs can be migrated to host 3. VMs can be migrated from host 2 to host 3 manually with no problem.

This bug does effect the operation of Xen Cloud Control System under the right circumstances. Attempting to evacuate and shut down a host will result in an endless loop of "Shutting down blocking VM ..." messages. I'll be giving XCCS it's own evacuate routines and the fix will be available Wednesday.

--
Vern Burke

SwiftWater Telecom
http://www.swiftwatertel.com
Xen Cloud Control System
http://www.xencloudcontrol.com


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