Lots & lots to consider. With files distributed across multiple servers, access and management is complicated but resilience against component failure is quite high. Once you start consolidating, management & access becomes much simpler, but resilience drops. Your choice of solution should be based on factors such as: how long can my business tolerate complete loss of access to the data? If I need to recover, how much data can I afford to lose? How quickly must I be able to get things up and running again? What sort of growth do I want to plan for in the future?
With such a large range of solutions on the market, I'd start with basic business questions first to give myself some edges to what is a rather fuzzy problem.
If resilience is a key concern, then do you need to consider dual-fabric SAN to provide fault-tolerance from HBA through switch to storage? Do you need to think about "FlashCopy"-capable hardware that can create practically instantaneous copies of data with no perceptible interruption to the application?
Here's a link that might give you some more ideas:
Since you are looking into consolidation, have you thought about using some sort of virtural solution, such as VmWare or Microsoft? Once you have a large SAN, managing the actual "servers", esp using a virtural solution becomes much easier.
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