>The IBM rep should have said: "The z means zero __unplanned__
downtime.". I am not aware of any OS on any platform which does not
require an occasional re-initialization (reboot, IPL, whatever

I think you've misunderstood IBM's intent.
With Parallel SYSPLEX, shared everything, IMSPLEX, and/or DB2PLEX, etcPLEX, and 
following the compatibility rules, you will come close to the goal of zERO!
A single image will not cut it.

PS: when IBM first started hyping the zERO, they stressed it was a goal, NOT a 
certainty!
Sent wirelessly from my BlackBerry device on the Bell network.
Envoyé sans fil par mon terminal mobile BlackBerry sur le réseau de Bell.

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