Apparatus and method for providing recoverability in mass storag

Details Apparatus and method for providing recoverability in mass storag Apparatus and method for providing recoverability in mass storag

1990-04-25

1992-08-11

Smith, Jerry

Excavating

371 101, 3642564, 3642685, 364DIG1, 3649612, 3649633, 364DIG2, G06F 1100

Patent

active

051387107

ABSTRACT:
Message Segments comprising Messages are stored in a flat file on disk. A unique Message Number is assigned to each Message and each Message Segment is stored at a flat file address (Segment Descriptor) in a record containing the Message Segment data and recovery information. the Recovery Information includes fields for an Available Marker, Message Number, Segment Sequence Number, Final Flag and Last Address. The Available Marker denotes whether the Message Segment is in-use or available. The Message Number field contains the Message Number identifying the Message which contains the Segment. The Segment Sequence Number donotes the order in a Message occupied by the Segment. The Final Flag field contains a flag if the Messge Segment is the Last Segment of the Message. The Last Address field contains the Segment Descriptor of the Last Message Segment of the Message containing the Segment. A data base for accessing the Message Segments is maintained on disk. Each data base record contains the Message Number identifying the Message and the Segment Descriptors of the Message Segments comprising the Message. Recovery and rebuilding of the data base from the Recovery Information in the flat file is performed if the data base inconsistency is detected. Comparisons of the Message Numbers in the data base and Recovery Information and testing the Availability Marker provide indicia for initiating recovery of the data base from the Recovery Information.

REFERENCES:
patent: 3840862 (1974-10-01), Ready
patent: 4148098 (1979-04-01), McCreight et al.
patent: 4419725 (1983-12-01), George et al.
patent: 4637024 (1987-01-01), Dixon et al.

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