The other vendors in this space, as you list, are HP, IBM and EMC. There are additional products available from other players that you may or may not consider high-end, depending on your definition, including those from Network Appliance. The difference between all of these is in the way they scale from an architecture perspective, reliability based on their architecture, and the way in which they handle their transactional loads, not to mention their management software, support structures, and many other criteria. If you can define your environment and your goals for the storage platform, I can help you in researching the right platform, or you may want to sketch out these details -- creating an RFP and sending it out to the vendors listed and see what their responses look like. This way, you can do an apples-to-apples comparison of the platforms. Finally, if you have the time and resources, you could create a test environment and do a bake-off of the platforms and get your own feel of the platforms.
Let me know if I can help you further.
Again, thank you.
This was first published in August 2006