System to pass through resource information

Details System to pass through resource information System to pass through resource information

1994-01-14

1995-08-29

Baker, Stephen M.

Boots, shoes, and leggings

364DIG1, 3642852, G06F 1114, G06F 1216

Patent

active

054468752

ABSTRACT:
A system for passing through resource information in a computer system including an actual process, a back-up process, and a shared memory connected to the actual process and the back-up process. The actual process includes information which is stored in the shared memory and passed through to the back-up process by passing the contents of the shared memory to the back-up process. The back-up process performs an operation as a new actual process after being passed the contents of the shared memory when the actual process is not operable. The shared memory includes two sets of areas which respectively include an original information area storing information which is transmitted from the actual process to the back-up process, and a difference area storing information related to a change when the actual process changes the original information area. The back-up process reads out information stored in a difference area of one of the two sets of areas and passes through the information stored therein related to the change. The actual process stores the changed information that is transmitted to the back-up process in the original information area of the back-up process and stores the information related to the change in the difference area of the back-up process. The original information stored in the original information area of an other of the two sets of areas is copied and the two sets of areas are switched when at least one of a preset time interval is reached and a preset volume stored in the difference area is reached. In an alternative embodiment, the information passed from the actual process to the back-up process is divided into two groups according to the frequency of change of the resource information. The resource information in a first group is passed through in a batch to the back-up process when the actual process crashes. The resource information in a second group is passed through to the back-up process intermittently after preset time intervals or after volumes of changed information reach a preset threshold.

REFERENCES:
patent: 4751702 (1988-06-01), Beier et al.
patent: 4819232 (1989-04-01), Krings
patent: 4823261 (1989-04-01), Bank et al.
Ouchi, et al., "Check Point Copy for A Two-State Store" IBM Technical Disclosure Bulletin, vol. 20, No. 5, Oct. 1977, pp. 1955-1958, New York.
Lai, W. "The Integrity of Data Delivery in Computer Networks", IEEE Trans. on Communications, vol. COM-33, No. 11, Nov. 1985, pp. 1222-1224.
"Rolling Checkpoint in A Transaction Processing System" IBM Technical Disclosure Bulletin, vol. 30, No. 6, Nov. 1987, pp. 351-353, New York.

Affiliated with

Also associated with

Rating

System to pass through resource information does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System to pass through resource information, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System to pass through resource information will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1827000