Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
1989-04-28
2001-06-19
Coleman, Eric (Department: 2302)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S015000
Reexamination Certificate
active
06249877
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a file recovery for a recovery system of files such as a historical file distributed to plurality of equipments connected to a common signal transmission line, and in particular, to a method and apparatus for distributed file recovery suitable for a system in which a file may possibly be destroyed and location of file recovery data cannot be determined.
In the conventional file system, although a plurality of files are distributed as described in a manual of a large-sized computer, the processing between files is controlled by a host computer in a concentrated fashion, and hence a command error may occur during a file recovery and the contents of a file thus recovered become different from the expected correct data; moreover, during the file recovery, the processing other than the recovery processing is prevented from being executed, which leads to a disadvantage that the processing efficiency of the system as a whole is lowered.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a method of distributed file recovery which is capable of effecting a file recovery even if the location of the file recovery data of a historical file or the like is not known and which is capable of simultaneously accomplishing operations of other equipments while executing the historical file recovery. To this end, according to the present invention, there is provided a method of distributed file recovery in a distributed file system comprising a plurality of equipment connected to a common signal transmission path a plurality of files each containing data of the same content stored in a sequence characterized in that an equipment for achieving a file recovery transmits to a transmission path a file information having contents for the file recovery and each equipment having received the file information judges whether or not its own file includes data of the same contents, and if the data is included, the equipment transmits the data to the transmission path; equipment for effecting a file recovery judges a current data necessary for the recovery and receives the necessary current data from the transmission path and each data format is provided with an information required, when generating a recovery data from the current data and the transmitted data, to keep a data consistency with respect to the other files; and the equipment executes the file recovery based on the information.
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Kasashima Hirokazu
Kawakami Setsuo
Kawano Katsumi
Koizumi Minoru
Mori Kinji
Antonelli Terry Stout & Kraus LLP
Coleman Eric
Hitachi , Ltd.
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