How much allowance should we make for data expansion
We're investing in a new SAN as part of a virtualisation project. We've been offered a massive range of SAN hardware with varying expansion capabilities and costs. What I want to know is how much should I expect our current data storage to increase in the next 5 years?
Obviously as part of the total cost of ownership calculation we need to be clear about when we'd need to grow beyond our current allowance. Most of the proposals have specified (at my request) approximately double our current backup data size. I am assuming that beyond a certain point (say 8 years) there is no reason to expect that any current device would be the ideal way to expand capacity.
I'd be very grateful for any advice.