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Fault tolerant data storage subsystem employing hierarchically arranged controllers

  • US 5,504,882 A
  • Filed: 06/20/1994
  • Issued: 04/02/1996
  • Est. Priority Date: 06/20/1994
  • Status: Expired due to Fees
First Claim
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1. A fault tolerant data storage subsystem, said data storage subsystem comprising:

  • a plurality of storage device controllers adapted to emulate a storage device, each storage device controller having a cache memory which includes multiple data input ports, multiple data output ports and at least one processing element for selectively interconnecting a selected data input port with a selected data output port within said cache memory;

    an interconnection for coupling a data output port of said cache memory within a first storage device controller with a data input port of said cache memory within a second storage device controller; and

    a first storage device selectively coupled to a dam output port of said cache memory within said second storage device controller wherein a multipath dynamically alterable hierarchical arrangement of storage device controllers is established.

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