Modern architecture: midrange mainframes

Modern architecture: midrange mainframes

Three midrange mainframe computers just announced by Unisys Corp. can run applications under both mainframe and Microsoft Windows operating systems.

The ClearPath Plus models reflect the company's move to put its cellular multiprocessing architecture in all its mainframes, marketing director Rod Sapp said. The architecture groups processors into four-CPU pods that can be swapped out quickly. It also replaces internal buses with a high-bandwidth crossbar interconnect.

The ClearPath Plus CS7201 accommodates up to 32 Intel Corp. processors, either 32-bit 900-MHz Pentium III Xeon or 64-bit Itanium chips. It runs either Win 2000 Advanced Server or Datacenter Server, but it also can run the Unisys MCP mainframe OS and MCP applications under Win 2000.

A capacity-on-demand feature lets users start with 150G of the system's 1T of internal storage switched on and later order a software key to activate more storage.

The ClearPath Plus CS7402 and the CS7802 models operate heterogeneously, Sapp said. The four- to 32-processor CS7402 can be configured with up to four partitions for separate Win 2000 or Unisys OS2200 applications. It requires a minimum of four Unisys CMOS processors, but the remaining chips can be either Unisys or Intel.

The CS7802 can handle up to eight partitions for OS2200 and Win 2000 apps, Sapp said.

The ClearPath Plus mainframes come with 2G to 64G of main memory and 96 PCI slots. A four-processor CS7402 that can execute 20 million instructions per second starts at $587,000.

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