Matthias, I am working in a combined webMethods / JDE XPI environment right now. The high availability concepts are the same because the xpi components are basically wM Broker or Integration server components.
As Igor mentions above you can always get someone from webMethods to give their blessing to your setup. I’m not sure if wM support is the right group to answer your questions on HA, but they should be able to pass your questions on to their architecture team.
Regards,
Wayne
#webMethods#Integration-Server-and-ESB