Immediately available, statically allocated,...

Details Immediately available, statically allocated,... Immediately available, statically allocated,...

2005-06-14

2005-06-14

Sparks, Donald (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S004000, C711S111000, C711S112000, C711S161000, C711S210000, C711S213000, C707S793000, C707S793000, C707S793000, C707S793000

Reexamination Certificate

active

06907505

ABSTRACT:
A hybrid LUN copy operation that ultimately produces a full LUN copy, but involves a transient snapshot-copy-like intermediate stage. In one embodiment, a statically pre-allocated copy LUN is initialized with references pointing back to the primary LUN. Over time, the sectors, blocks, or other data-storage units of the primary LUN are copied to the copy LUN, so that, in the end, a full copy LUN in completed. In a second, alternative embodiment, both the primary LUN and copy LUN are READ and WRITE accessible immediately following the nearly instantaneous initialization of the copy LUN. In both embodiments, the copy LUN may be statically allocated. The immediate-full-LUN-copy operations provided by the present invention further enable rotatable copy-LUN groups, each copy LUN within a copy-LUN group representing a full, robust copy LUN.

REFERENCES:
patent: 6594745 (2003-07-01), Grover
patent: 6618794 (2003-09-01), Sicola et al.
patent: 6721902 (2004-04-01), Cochran
patent: 2003/0188035 (2003-10-01), Lubbers et al.
patent: 2003/0188218 (2003-10-01), Lubbers et al.
Cabrera et al., Mar. 5-9, 1995, IEEE, pp. 420-427.

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