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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
Xen Cloud Control System

Xen-users mailing list

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