#Exchange2010 .. This is an interesting blog by Mark Arnold
Lots of testing of various stores under various situations. As you know SIS has been eliminated from Exchange 2010 and a form of store compression introduced. This, along with the other capabilities of the NetApp platform have played right into our hands. NetApp is the only vendor to offer deduplication on primary data. The deduplication is not an in-line process but rather is scheduled. Hourly, twice daily, daily, weekly, whatever. You set it to suit your requirements.
but a NetApp drive is twice the cost of a HP DAS/MSA drive and thats forgetting the cost of the filer head and dedup license.
Also would you put multiple copy of a DAG on the same filer head....NO! as this is a point of failure. So your only dedup messages in different database on the same DAG members,
Therefore the saving is minimal and outweighed by dumping the NetApp and going DAS and JBOD!