IBM® Multiprise® 3000 system was the smallest S/390® system produced in recent years. The MP3000 has one or two S/390 processors plus a SAP processor. It also has internal disk drives that can be configured to operate as normal IBM 3390 disk drives. A minimal internal tape drive is normally used for software installation. The MP3000 can have a substantial number of ESCON® or parallel channels for connection to traditional external I/O devices. The MP3000 can be configured with LPARs and might run both test and production systems. In many cases no external traditional I/O devices are needed.