Patent EP0083422A2 successfully refreshed from Google Patents.
EP0083422A2
Expired / Lapsed
EP
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Cross checking among service processors in a multi-processor system
Assignee: International Business Machines Corp
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Filing: 1982-12-07
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Granted: —
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Expires: 2002-12-07
Abstract
Abstract In a multiprocessor system which includes a plurality of service processors (1A, 1B), only one of the service processors is actively in control of the system, while the other is a backup. Upon the occurrence of a malfunction in the active service processor, the standby service processor can be switched in to assume control of the system. The service processor which had been active then becomes the backup system.
Inventors
- 👤 Robert Eugene Griscom
- 👤 Thomas Andrew Stranko
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 12:38
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
Multiprocessing system, characterized by at least two service processors (1A, 1B) each of which is capable of monitoring and controlling various aspects of the multiprocessing system; means (7A, 7B, 8A, 8B, 9A, 9B) for insuring that one service processor is actively in control of the system, and at least one other service processor is available as a backup in case of malfunction of the active service processor; and means (control of 7A, 7B, 8A, 8B, 9A, 9B) responsive to detection of one of a set of predetermined conditions to cause the active and backup service processors to exchange functions.
Claim 2
Dependent Claim
99 words
Multiprocessing system, characterized by at least two service processors (1A, 1B) each of which is capable of monitoring and controlling various aspects of the multiprocessing system; means (7A, 7B, 8A, 8B, 9A, 9B) for insuring that one service processor is actively in control of the system, and at least one other service processor is available as a backup in case of malfunction of the active service processor; and means (control of 7A, 7B, 8A, 8B, 9A, 9B) responsive to detection of one of a set of predetermined conditions to cause the active and backup service processors to exchange functions.
Claim 3
Dependent Claim
27 words
Multiprocessing system of Claim 1, characterized in that the presence of any of said predetermined conditions causes a reinitialization of the service processor which had been backup.
Claim 4
Dependent Claim
25 words
Multiprocessor system of Claim 2 characterized in that, upon detection of any of said predetermined conditions, both of said service processors (lA, 1B) are reinitialized.
Claim 5
Dependent Claim
30 words
Multiprocessor system of Claim 3 further characterized by means for initializing both of said service processors; and means for selecting one service processor to initially be the active service processor.
Claim 6
Dependent Claim
15 words
Multiprocessor system of Claim 4, characterized in that said selection means comprises a manual switch.
Claim 7
Dependent Claim
36 words
Multiprocessor system of Claim 4, characterized in that said selection means comprises means for selecting as the initially active service processor the first of said service processors to reach a certain predetermined stage in its initialization.
Claim 8
Dependent Claim
32 words
Multiprocessor system of Claim 6 further characterized by tiebreaking means for selecting one of said service processors in the event that they both reach the predetermined stage in their initializations substantially simultaneously.
Claim 9
Dependent Claim
47 words
Multiprocessor system of Claim 2 further characterized by means responsive to detection of one of said predetermined conditions for reinitializing both service processors; and means for insuring that, after reinitialization, the service processor which previously had been the backup service processor will become the active service processor.
References Cited (Backward Citations)
No citation records indexed.
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