Control method for preventing incorrect reset of common resource

Details Control method for preventing incorrect reset of common resource Control method for preventing incorrect reset of common resource

1991-05-17

1994-04-05

Atkinson, Charles E.

Excavating

371 12, G06F 1100, G06F 1300

Patent

active

053013115

ABSTRACT:
A control method and system for preventing the incorrect resetting of a common resource in a multicomputer system comprising a plurality of clusters each having a processor and a common memory which each cluster can access. The method includes steps of storing in a common memory an IPL (initial Program Load) generation ID (Identifier) which is unique to an IPL number of each cluster, setting an acquisition ID and the IPL generation ID in the common resource, when the right to use the common resource in the common memory is acquired, and comparing the IPL generation ID when the faulty cluster stops, with the IPL generation ID set in the common resource, and only when the two IPL generation IDs are equal, resetting the right to use the common resource, when the right to use the common resource which the stopped faulty cluster acquires is reset. Thus, when resetting a common resource when a cluster included in a system stops operating due to a fault, incorrect resetting can be prevented, so that the cluster does not reset the right to use the common resource acquired after restart by the IPL.

REFERENCES:
patent: 4308580 (1981-12-01), Ohtaki
patent: 4497026 (1985-01-01), Braschel et al.
patent: 4841439 (1989-06-01), Nishikawa et al.
patent: 4930128 (1990-05-01), Suzuki et al.
European Search Report for Application No. EP 91 10 7395.
Abstract-Japanese Application No. JP870209329.

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