Storage dispersal system based on related, shared data storage s

Details Storage dispersal system based on related, shared data storage s Storage dispersal system based on related, shared data storage s

1996-12-19

1999-01-12

Lane, Jack A.

Electrical computers and digital processing systems: memory

Storage accessing and control

Memory configuring

711171, 707200, G06F 1200

Patent

active

058601325

ABSTRACT:
A system and method are provided for dispersing storage of a plurality of related and unrelated data items on a plurality of removable recordable media instances (RMIs). A first storage device is provided for storing a data item on a qualifying related RMI, the qualifying related RMI having one or more related data items stored on it and having sufficient actual storage space remaining for storing the data. A multiplier device is connected to the first storage device for multiplying the actual size of a data item, which is not stored by the first storage device because there is no qualifying related RMI, by a factor greater than one, to produce reserved storage space data which characterizes any other RMI that actually stores the data item. A second storage device, which is responsive to the multiplier device is provided for storing a data item on a qualifying unrelated RMI, the qualifying unrelated RMI having one or more unrelated data items stored on it and having sufficient actual and unreserved storage space remaining to store the data item and, if there is no qualifying unrelated RMI, then storing the data item on a new RMI the new RMI having no data stored on it. This arrangement provides for shared logical space reservation so that physical proximity of related data items is optimized with respect to a set of RMIs.

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S.A. Eilbott, "File Access Staging Facility for Computer Systems", IBM Technical Disclosure Bulletin, Jun. 1992, pp. 7-9.

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