EP0116366A2
Expired / Lapsed
EP
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Method for controlling storage of data sets in memory unit
Assignee: Hitachi Ltd
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Filing: 1984-02-07
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Granted: —
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Expires: 2004-02-07
Abstract
Abstract In a computer system, there is provided the information (7) representing empty areas generated when data sets (33) are stored in a magnetic disk apparatus (3). From the information, the total capacity (A) of empty areas and the degree of nonuniformity (B/A) in size of empty areas are derived. If the result (83) indicates that a sufficient effect is brought about by effecting recompilation processing of restoring the data sets by packing empty areas, the recompilation processing is carried out (91).
Inventors
- 👤 Mitsuru Doki
- 👤 Takayasu Yamakawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 17:08
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/06; G06F3/0601; G06F3/0602; G06F3/0608; G06F3/0628; G06F3/0629; G06F3/0631; G06F3/0668; G06F3/0671; G06F3/0673; G06F3/0674; G06F3/0676
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
A method for controlling storage of data sets (33) in a computer system having a plurality of data sets stored in a magnetic disk apparatus (3) comprising the steps of: (a) recording (67) in said magnetic disk apparatus empty area information record (7) for indicating a plurality of empty areas generated by storing the data sets into said magnetic disk apparatus; (b) reading out (82, 84) said empty area information record to examine states of empty areas; and (c) executing (85 to 91) processing for restoring, in accordance with said states of empty areas, said data sets stored in said magnetic disk apparatus.
Claim 2
Independent Claim
103 words
A method for controlling storage of data sets (33) in a computer system having a plurality of data sets stored in a magnetic disk apparatus (3) comprising the steps of: (a) recording (67) in said magnetic disk apparatus empty area information record (7) for indicating a plurality of empty areas generated by storing the data sets into said magnetic disk apparatus; (b) reading out (82, 84) said empty area information record to examine states of empty areas; and (c) executing (85 to 91) processing for restoring, in accordance with said states of empty areas, said data sets stored in said magnetic disk apparatus.
Claim 3
Independent Claim
83 words
A method for controlling storage of data sets according to Claim I, wherein said empty area information record represents the location and the size of each of empty areas, and wherein said reading step (b) comprises examining the total size (A) of said empty areas and the degree of nonuniformity in size of empty areas, said step (c) comprises executing said processing when said total size exceeds a predetermined value (a) and said degree of nonuniformity is smaller than another predetermined value (β).
Claim 4
Dependent Claim
49 words
A method for controlling storage of data sets according to Claim 2, wherein said step (b) comprises representing (85) said degree of nonuniformity by the ratio (B/A) of the total size of a predetermined number (B) of largest-sized empty areas to the total size (A) of all empty areas.
References Cited (Backward Citations)
No citation records indexed.
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