[Tilesathome] two different servers used

[Olf]

Hello !

I'm running two clients (windows) on two computers (with different user 
names).
One  was still using tah.openstreetmap.org and the second uses 
server.tah.openstreetmap.org

Visiting tah.openstreetmap.org and server.tah.openstreetmap.org with my 
browser, I see that
there is traffic one both servers (different) - on both there are 
currently requests handed out
to clients and uploads came in.

Question: are both servers productive or is this a matter of DNS-updates 
(because of the new server)
After rebooting my DNS-Server both clients now use 
server.tah.openstreetmap.org

rgards

Olf