Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Patent
1997-06-27
1999-08-17
Beausoliel, Jr., Robert W.
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
710101, 710126, 710 2, 710 3, 710 9, G06F 1100, G06F 1300, G06F 1340
Patent
active
059387769
ABSTRACT:
In a SCSI subsystem having mixed wide and narrow SCSI devices installed, a method and apparatus is provided for detecting a narrow SCSI device illegally installed at a slot assigned to a wide SCSI device. To detect the narrow SCSI device installed at an illegal location, high ID and low ID SCSI bus address pairs are set as test pairs for the SCSI subsystem. The low ID is the alias of the high ID if a narrow SCSI device is installed at the high ID slot. To detect a conflict with a controller ID, a non-responsive ID bus address corresponding to a slot known to be unused is called. A response to this call indicates a narrow SCSI device is installed at the high ID of the test pair and the narrow SCSI device at the high ID has configured to an alias bus address matching the controller ID. To detect a present conflict between SCSI devices, the low ID bus address in the test pair is called. A conflict in responses indicates a SCSI device is installed at the low ID and a narrow SCSI device is installed at the high ID of the test pair. To detect a future conflict between a narrow SCSI device at a high ID and a SCSI device installed in the future at an unused low ID, both the low ID and the high ID are called. No response to the high ID call in combination with a response to the low ID call indicates a narrow SCSI device is installed at the high ID and the narrow SCSI device would conflict in the future with a SCSI device subsequently installed at the unused low ID.
REFERENCES:
patent: 5239632 (1993-08-01), Larner
patent: 5594879 (1997-01-01), Belmont
patent: 5596727 (1997-01-01), Literati et al.
patent: 5751977 (1998-05-01), Alexander
Hare Mike
Nemeth Frank M.
Sardeson Bruce
Schow Brian
Sicola Stephen J.
Beausoliel, Jr. Robert W.
Digital Equipment Corporation
Knearl Homer L.
Kubida William J.
Shaw Brian H.
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