Intel Paragon XP/E

In 1993, an entry-level Paragon XP/E variant was announced with up to 32 compute nodes. The system architecture was a partitioned system, with the majority of the system comprising diskless compute nodes and a small number of I/O nodes interactive service nodes. Since the bulk of the nodes had no permanent storage, it was possible to "Red/Black switch" the compute partition from classified to unclassified by disconnecting one set of I/O nodes with classified disks and then connecting an unclassified I/O partition.