They're racks of disks.
HP and Dell have issues. Racks of spinning disks are not how we're solving the IOP/s issues we have for server consolidation and VDI now, and they're not going to be the answer to this problem at any future time. That day is done. Racks of disks are expensive. They're hot. They burn a lot of power. To be honest, the only way racks of disks make sense is if you consider each drive's RAM cache to be the only storage you're using and at that cost you may as well use Flash backed RAMDisk.
It's time to talk about spinning disk as "near line" storage. It's the new tape. Maybe it's fine for files and backups and archiving but for modern storage to consolidated servers we need more grunt. Frankly near-line storage to back a file server is better done in other ways.
Texas Memory Systems can double the best SAN 3Par can offer in a multi-rack solution (T800) (250K IOPS) as a 3 RU module that burns 450 watts. Neither one is cheap, but the TMS is far cheaper and offers much lower latency.
The nearline capacity is nice, but for innovative storage today we need high-density SSD and this ain't it. HP has other answers for backing filestores that scale nearly infinitely with performance and speed in their recent LeftHand acquisition among others. HP doesn't need 3PAR.
The only way this makes sense is in the case of a billion-dollar game of "keep-away", where HP's goal for buying the thing is to kill it to keep Dell from having it. That's puzzling because HP doesn't usually work that way, and even if they did Dell's just going to scratch 3PAR and move to the next small storage vendor down their list.
It just doesn't add up. Something is wrong here. This looks like an ego battle.