System for monitoring a library unit shared as input/output with

Details System for monitoring a library unit shared as input/output with System for monitoring a library unit shared as input/output with

1994-09-06

1997-01-14

Lee, Thomas C.

Boots, shoes, and leggings

395287, 3642383, 364240, 364230, 3642329, G06F 1310

Patent

active

055949223

ABSTRACT:
A plurality of higher-level units are connected to a library unit, for example, as a lower-level unit through an SCSI. Furthermore, the plurality of higher-level units are connected by means of a communication path to mutually exchange information regarding the status of use of SCSI for the access to the lower-level library unit. A monitoring control section is provided in each of the plurality of higher-level units to instruct necessary processing in response to the status of use of SCSI. Particularly, when an abnormal occupation of SCSI caused by hang-up of any other higher-level unit is detected by the monitoring control section of a higher-level unit, the higher-level unit instructs its own SCSI controller to reset the bus to achieve bus reset of the other SCSI controller, thus releasing the occupation.

REFERENCES:
patent: 4276593 (1981-06-01), Hansen
patent: 5283872 (1994-02-01), Ohnishi
patent: 5386545 (1995-01-01), Gombos, Jr. et al.
patent: 5454083 (1995-09-01), Choi

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