nirv - 7:23 am on Jan 25, 2002 (gmt 0)

What is the relationship between all three google servers? In the past I have noticed that some of my pages have move of my newer pages appeared on some either www2 or www3 but not on their "main" www.google.com server? Now I searched www3 server and it contains yet another "semi-old" version. The recent version is nowhere to be found.