Multiprocessor system for updating status information through fl

Details Multiprocessor system for updating status information through fl Multiprocessor system for updating status information through fl

1986-11-24

1989-04-18

Williams, Jr., Archie E.

Boots, shoes, and leggings

364134, G06F 1574, G06F 1130

Patent

active

048232610

ABSTRACT:
An apparatus and method employs dual checkpoint data sets for communicating system status. A journal of changed data is implemented to reduce I/O to a subsystem's shared data area on a non-volatile shared storage device. The journal provides for an increase in the amount of time that a processor may have access to the shared data area. Also, two versions of the data area are implemented in order to insure the integrity of the continuously updated data area. The two versions flip-flop depending upon which one has the most recent updates. That is, the version that has the most recent updates becomes the to-be-read-from data area and is read by the processor that currently has access to the shared data area during this series of I/O operations. The other version becomes the to-be-written-to data area and is written to by the processor that currently has access to the data area in order to update the to-be-written-to version to the current level. The to-be-written-to version then becomes the to-be-read-from version during the next series of I/O operations.

REFERENCES:
patent: 4413327 (1983-11-01), Sabo et al.
patent: 4591976 (1986-05-01), Webber et al.
patent: 4654819 (1987-03-01), Stiffler et al.
Donald Hann "Channel Programming--Reviewing the Basics".

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