Sparse multi-component files

Details Sparse multi-component files Sparse multi-component files

2007-03-20

2007-03-20

Bragdon, Reginald (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

Reexamination Certificate

active

10831936

ABSTRACT:
A file is striped across multiple filers, file servers or other devices, to create a sparsely striped multi-component file. Each filer stores one sparse component. In particular, each component physically stores only those stripes allocated to that component. The other stripes are represented as holes. Thus, instead of contiguously packing each component's stripes at the block level, each component is a file having the same logical structure. A component of a sparsely striped multi-component file can be easily converted to a mirror by filling in its holes. Similarly, a mirror can be easily converted to one component of a sparsely striped multi-component file by removing or ignoring it unallocated stripes. In either case, the layout or logical of the component does not need to be reconfigured.

REFERENCES:
patent: 5960169 (1999-09-01), Styczinski
patent: 6052759 (2000-04-01), Stallmo et al.
patent: 2004/0268068 (2004-12-01), Curran et al.
PCT International Search Report for PCT Application No. PCT/US2005/010355, mailed Apr. 10, 2006 (3 pages).
PCT Written Opinion of the International Searching Authority for PCT Application No. PCT/US2005/101355, mailed Apr. 10, 2006 (5 pages).

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