Dear, all. I googled and found some people mentioned that openldap does not work under Xen with db database backends and the information were from 2006 http://www.openldap.org/lists/openldap-software/200603/msg00199.html. I actually encountered this myself and I am not sure if this is still the same problem.
--Quanah
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Quanah Gibson-Mount Principal Software Engineer Zimbra, Inc -------------------- Zimbra :: the leader in open source messaging and collaboration