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Understanding SANs with regard to exchange sizing

mistaj
mistaj asked
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Last Modified: 2013-11-14
I am looking at sizing a SAN for exchange.
I have never used SANs before and am trying to understand the basics after going through some documentation.
We may in future be sizing a SAN for an exchange site

What I dont understand is it seems you size the storage according to exchange performance - i.e. number of disks, etc yet i see no references to exchage storage requirements in terms of size?

It also seems the required storage in the example case studies far exceeds what may be necessary.

Are the disks arranged purely for fast access times and in essence only  a portion of the disks physical storage is used? how is this storage calculated?
Would appreciate anyone who could ellaborate on this as much as possible.
I want to get these basics straight in my own head befroe i start speaking to HP, EMC or any other SAN vendors.
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