Method for reclaiming fragmented space on a physical data storag

Details Method for reclaiming fragmented space on a physical data storag Method for reclaiming fragmented space on a physical data storag

1998-05-27

2000-11-21

Cabeca, John W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Memory configuring

711171, 711172, 711173, G06F 1200

Patent

active

06151666&

ABSTRACT:
The present invention provides a method for selectively reclaiming fragmented space on a multiple volume cartridge (MVC) device using a cost-benefit type analysis to determine whether making the fragmented space useable justifies moving all nonexpired data volume sets to another MVC. The present invention analyzes the allocation of space on the MVC to determine the location and size of any gaps between nonexpired data volume sets. Any gaps appearing at the end of the MVC are automatically reallocated for subsequent use. Any gaps appearing between nonexpired data volume sets are analyzed to determine whether the size and location meet predetermined criteria before moving any of the nonexpired data volume sets. In addition, the present invention allows selective movement of less than all of the nonexpired data volume sets if the size of the separating gap is larger than any nonexpired data volume sets appearing after the gap.

REFERENCES:
patent: 5276867 (1994-01-01), Kenley et al.
patent: 5479656 (1995-12-01), Rawlings, III
patent: 5646871 (1997-07-01), Cadot
patent: 5778392 (1998-07-01), Stockman et al.
patent: 5802599 (1998-09-01), Cabrera et al.

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