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Large computer systems usually use purpose specific storage based on the requirements of the system. For instance, a large file server would use several racks of simple storage servers usually via something like iSCSI over fiber or Infiniband. A large super computer may not need that much storage, but it would need to be faster, so there would be large RAM requirements with little permanent storage to speak of. A Cray CX1 Supercomputer can have up to 64 Processors interconnected, but while a large computing system, usually has less need for disk space. The HP NonStop OS for highly available "never go offline" kind of systems are used for things like certain stock exchanges, and have both a large number of storage disks and a large amount of RAM in most applications.
Specific Disk types are traditionally SCSI or SAS drives, but the rise of SATA speeds and reliablity, coupled with the much cheaper cost means many storage systems are moving to the new SATA standards. SCSI has higher reliability, but if an SATA drive can store more, and for a fourth of the cost, it's sometimes more cost effective to create a storage array that can stand to lose several drives from a RAID array, and simply have disks on hand to replace them as they go. SCSI is still used in situations where such maintenance is not much of an option.
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