The computer includes 20 SGI Altix clusters with 512 processors apiece and 10,240 Intel processors, and it has a peak processing power of 62 trillion floating point operations per second (teraflops).
....we thought 440 Tbytes of disk would be enough ...... adding 600 Tbytes of disk
Source: Byte and Switch - Grid Computing - NASA Upgrades Supercomputer - Storage Networking News Analysis