It was a nightmare ^.^
The upgrade itself went smooth with only 2 errors (due to modified schema which I had overlooked), but getting all the hacks working again ...
Also, I accidently killed the whole database ... and restorig some 60 million recorsds from a dump and doing the upgrade process again caused approx 1/2 day downtime.
So in fact it was down for almost 2 days, instead of the one that was planned.
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