Frank Tegtmeyer writes:

About two months ago there was a discussion about monitoring the Zope processes. Someone mentioned daemontools of Daniel J. Bernstein.

Because I use daemontools for several other applications I tried it with Zope too.

See my article at http://www.lightwerk.de/zope/monitoring if you are interested for "how to set up and use" this combination.

I notice that your setup requires the -D switch to z2.py. This does a number of things other than preventing the controlling terminal from detaching. Most of these other things (no multiple threads, enabling internal debugging support) will harm the performance of your Zope server.