de.wikipedia.org is our second-biggest wiki. It's fortunate enough to not only be not too big to upgrade overnight, but to have an 'overnight' in the first place. ;)
The upgrade process itself went quite smoothly.
This weekend we'll want to switch database masters to one of the new machines, which has more disk space available. That will involve a brief lock of all wikis to read-only while things are switched around.
-- brion vibber (brion @ pobox.com)