Take a look at this video by hp computers and what they did to a mainframe computer and back up storage... it was filmed in rention, washington USA at railway mueasum with a locomotive.
It's not a mainframe, it's a storage array. "EVA" means "Enterprise Virtual Array"
The alternating items above and below the laptop are controllers and disk banks. These "controllers" are not compute engines (a'la "mainframe") but rather the computers necessary to control the disks and present them to servers (or, if connected correctly, mainframes) as usable storage. That is, their processing power is totally committed to storage tasks. He's got a large number of controllers relative the the amount of storage. Perhaps because it's TurboTax or, more likely, because it was necessary to get the speed they wanted for the demonstration. Look here
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lower right drawing, for a more typical configuration for a large capacity storage array.
Also, if interested, check out the Wikipedia entries on "mainframe" and "storage array."
Or ask an HP or EMC employee (or a former one, like me) if it's a "mainframe" or a "storage array." If you look up the Wiki entry you'll see EMC's CLARiiON. The CLARiiON is in direct competition with the HP EVA. I worked the CLARiiON, and we frequently discussed HP systems. I guarantee you they're both storage arrays, not a mainframes.
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