Originally Posted by Linnet
The European ones are in Paris (and I think some in Frankfurt also).
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That was at (EU) release, almost 3 years ago. By now there are more than 5 datacentres in use, as far as I know. In fact, pretty much each battlegroup is in its own data center (though there is an artifical language barrier there, too, the english BG ruin could very well be in the same center as the german BG Verderbnis).
In the past, pre-BG era you could map out which realm is in which data center when they had a total connectivity loss to one of them, so you saw which realms it affected. On maintenance days ocassionally, an entire data center had issues and their realms remained down 3 hrs longer or so. This was then all visible on the realm-status page. Together with a few token chars on these realms and IP traces you could map them out a bit.
Now with the battle groups, that's pretty much the separation, I haven't yet seen realms in different BGs having the same IP destination as those within the BG. However I've onyl did this shortly after the introduction of the BGs, so it may have changed.
The english language EU realms are divided into 10 BGs, so that would mean at least 10 data centers throughout Europe. Some are in France, some are in Germany and I'd expect at least one in the UK. Switzerland hasn't got one, I'd know that as I have strong ties to the ISP scene here.