Method for accelerating disk array write operations using segmen

Details Method for accelerating disk array write operations using segmen Method for accelerating disk array write operations using segmen

1997-07-31

2000-11-14

Nguyen, Hiep T.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711114, 711129, 711173, 710 53, 714 6, G06F 1208

Patent

active

061483680

ABSTRACT:
Method and apparatus for accelerating write operations logging write requests in a log structured cache and by expanding the log structured cache using a cache-extension disk region. The log structured cache include a cache memory region partitioned into one or more write cache segments and one or more redundancy-data (parity) cache segments. The cache-extension disk region is a portion of a disk array separate from a main disk region. The cache-extension disk region is also partitioned into segments and is used to extend the size of the log structured cache. The main disk region is instead managed in accordance with storage management techniques (e.g., RAID storage management). The write cache segment is partitioned into multiple write cache segments so that when one is full another can be used to handle new write requests. When one of these multiple write cache segments is filled, it is moved to the cache-extension disk region thereby freeing the write cache segment for reuse. The redundancy-data (parity) cache segment holds redundancy data for recent write requests, thereby assuring integrity of the logged write request data in the log structured cache.

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