+++ This bug was initially created as a clone of Bug #836396 +++ Another idea I just had was to serialize the power commands by power address. Of course we already serialize them by system, but it might help with the APC PDUs for example which I imagine might have 20 different systems hooked up to the same PDU. It will prevent us trying to run multiple power commands against the same PDU concurrently, which I don't think they like.
On Gerrit: http://gerrit.beaker-project.org/1185
Beaker 0.9.1 has been released.