Well it depends on where your problem lays, but it sounds like spindle contention in which case you can either limit the I/O for specific data via QOS (storage or VMware) or add more disk and you have plenty of scope within the current 10400 without needing to break out to another array. If your workload is write intensive, given you have plenty of free space, you could also consider converting some of the busier stuff to Raid 10 via DO, meaning less backend I/O overhead.
Whether SSD will be of benefit will be dependent on the I/O density of your data, you can get a feel for this via the System Reporter AO reports which will show the amount of data that would be able to take advantage of SSD. If you need help interpreting this then speak to HP Presales who can provide this FOC. With the new 480GB and 920GB SSD drives cost per GB has reduced significantly.
VSA & VSAN solutions are good on paper, but the need to mirror everything between nodes over an IP stack will add even more latency, especially in a write intensive environment, I would steer away from this unless it's for a very specific use case.
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