Chaining of blocks for optimal performance with DASD (Direct...

Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition

Reexamination Certificate

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C711S170000, C711S173000

Reexamination Certificate

active

07107396

ABSTRACT:
A system for managing variable sized pages of possibly non contiguous blocks in a Non-Volatile-Storage (NVS) for attaining a consistent NVS that survives malfunction events. Each page includes a self describing block or linked list of self describing blocks. the system includes: Volatile Storage storing auxiliary modules, means for performing an atomic “create a new page” procedure. Means for performing an atomic write “add block” procedure for adding a possibly non contiguous block to a page. The newly added block has a back pointer to a previous block in the page. Means for performing a “delete page” procedure for deleting all blocks in a page. Means for performing a recovery procedure for rolling backward the add block procedure and rolling forward the delete page procedure, in case of malfunction event, thereby attaining consistent NVS.

REFERENCES:
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patent: 5568639 (1996-10-01), Wilcox et al.
patent: 5652864 (1997-07-01), Hine
patent: 6012063 (2000-01-01), Bodnar
patent: 6694318 (2004-02-01), Howard
patent: 2003/0191745 (2003-10-01), Jiang et al.

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