@Matt

Your EMC sales grunt is correct - the MSA1K is active-passive. Your HP_UX servers may be active-active in your cluster, but the storage you're clustering on has controllers that can only operate in an active-passive manner. Fortunately because you only have a couple of servers on the array, you're unlikely to see a degradation of performance.

For 60 drives, an EVA is not a cost-effective option versus the AX4-5 from EMC - it's in a mid-range price bracket. HP's MSA2K and EMC's AX4-5 are at low-end price points.

Regarding drive sizes, the MSA2000 is also SAS/SATA backend and therefore it will not be supporting 300GB 15K SCSI drives. HP has switched this from a SCSI to a SAS/SATA backend. It will likely have the same industry standard 400GB 10K drives or 146K 15K drives as the EMC model - and yes, ultimately 1TB SATA drives. Unfortunately as the product has been pre-launched and is not actually available to purchase for another month, there's no way of confirming this.