Methods and systems for efficiently managing persistent storage

Details Methods and systems for efficiently managing persistent storage Methods and systems for efficiently managing persistent storage

2005-02-01

2005-02-01

Vital, Pierre M. (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S170000, C707S793000

Reexamination Certificate

active

06851021

ABSTRACT:
A log of transactions is maintained on a persistent storage device. When a block of storage is allocated or deallocated, this transaction is recorded. If the persistent storage device is allowed to be slightly obsolete (i.e., not fully up-to-date), the log stored on the persistent storage device does not necessarily have to be updated right away. By delaying log updating until a certain number of transactions have transpired, memory seeks can be reduced, significantly improving performance. Further, directory information on the persistent storage device may be periodically updated from the log. This is preferably done infrequently enough so that the amortized cost for updating directory information is low.

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U.S. Appl. No. 09/504,610, filed Feb. 15, 2000, Challenger et al., “System and Method for Persistent and Robust Storage Allocation.”

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