Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Patent
1997-05-29
2000-08-01
Thai, Tuan V.
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
711100, 711111, G06F 1200, G06F 1300
Patent
active
060981482
ABSTRACT:
Digital data records are stored on a direct access storage device (DASD) in emulation of sequential-access media, the efficiency of storage and access of the data being improved by using a volume trailer containing various statistics about the records. Data is preferably stored in records, logically assembled into record groups. Interspersed with the records, there may be one or more marker codes, which function like tape marks among the various data records. The volume trailer contains pointers to each record group, record counts for each group, marker code counts for each group, and may also include fields showing whether records in a given record group are of equal length. The volume trailer may also include a volume trailer "tail", including a byte count for the entire volume trailer, and a unique sequence identifying the volume trailer. Statistics contained in the volume trailer enable substantially more efficient access of the data by a DASD. For example, record groupings, group counts, and/or marker code counts may be employed to perform operations such as locate, forward space file, and backward space file.
REFERENCES:
patent: 4130867 (1978-12-01), Bachman et al.
patent: 4467421 (1984-08-01), White
patent: 4947367 (1990-08-01), Chang et al.
patent: 5129088 (1992-07-01), Auslander et al.
patent: 5455926 (1995-10-01), Keele et al.
patent: 5459853 (1995-10-01), Best et al.
patent: 5577222 (1996-11-01), Micka et al.
patent: 5584008 (1996-12-01), Shimada et al.
patent: 5584018 (1996-12-01), Kamiyama
patent: 5606679 (1997-02-01), Cohn et al.
patent: 5805864 (1998-09-01), Carlson et al.
patent: 5809511 (1998-09-01), Carlson et al.
U.S. Patent application No. 08/778,118, filed Jan. 2, 1997, entitled "Outboard Data Migration in a Volume Stacking Library", in the names of J. W. Peake et al.; now patent 5809511.
U.S. Patent application No.: 08/707,891, filed Sep. 10, 1996, entitled "Virtual Integrated Cartridge Loader for Virtual Tape Storage System", in the names of Carlson et al.; now patent 5805864.
International Business Machines - Corporation
Thai Tuan V.
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