Hi,

good question. The short answer is: We know our data will grow. We want to do our current tasks in the future, so we want 10x performance and capacity. It is not clear how fast our data will grow, so we want to be sure to have some additional capacity available.

P.S.

I have openend a small suvey about SAN systems here:

http://www.sqlservercentral.com/Forums/Topic1052953-377-1.aspx