I've put European mobile traffic on the esams mobile servers during the last 2 hours.
As far as I can tell from the stats & logs, it's working just fine.
The Ganglia graphs are here:
http://ganglia.wikimedia.org/latest/?c=Mobile%20caches%20esams&m=cpu_rep...
cp3013 and cp3014 will be added to these two in the following weeks; they're currently unreachable due to a management interface misconfiguration.
Should there be any problems, the previous situation can easily be restored through normal GeoDNS configuration[1]; a quick way to do that is to copy /etc/powerdns/scenarios/esams-down/m.wikimedia.org to /etc/powerdns/scenarios/normal/m.wikimedia.org and running 'authdns-update', on dobson.
[1] https://wikitech.wikimedia.org/wiki/DNS#Geographic_DNS