Fencing system for standard interfaces for storage devices

Details Fencing system for standard interfaces for storage devices Fencing system for standard interfaces for storage devices

1995-10-20

1998-06-09

Sheikh, Ayaz R.

395835, 395836, 395838, 395311, 39518208, 39520057, 39520059, H01J 1300

Patent

active

057650349

ABSTRACT:
A fencing system for a small systems computer interface (SCSI) bus based multiprocessor system having a first processor, a second processor, a peripheral device and a SCSI bus for connecting the first and the second processors to the peripheral device. The inventive fencing system is connected to the SCSI bus and includes a system controller for generating a fencing signal and a device address. A fence control circuit is included for receiving the fencing signal and the device address and for disabling communication between the first processor and the peripheral device in response thereto. In a particular embodiment, a differential driver and receiver are provided on each line of the SCSI bus. The fencing system disables each driver and receiver for the processor to be fenced effectively isolating it from the peripheral device or its controller. Hence, the invention provides a system and technique for fencing nonproprietary i.e., SCSI based clusters of processors.

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