Emc IP Holding Company LLC

David John Agans

Henry Austin Spang, Iv

Philippe Armangau

David W Harvey

Long Zhang

Mark J Cariddi

Gregory S Schaffer

Chris Seibel

A method, computer program product, and computing system for determining a queue depth and a flush rate for each of a plurality of pending data queues associated with a cache system, thus defining a queue depth/flush rate pair for each of the plurality of pending data queues. A predicted drain time is determined for each of the plurality of pending data queues based, at least in part, upon the queue depth/flush rate pair, thus defining a plurality of predicted drain times that are respectively associated with the plurality of pending data queues.

Cache management system and method

Described are techniques for evaluating a plurality of caching techniques. Cache decision engines (CDEs) are executed where each CDE uses a different caching technique. The CDEs includes a first CDE that performs data caching in accordance with a plurality of I/O operations and one or more other CDEs each simulating data caching in accordance with the plurality of I/O operations. Sets of performance data are determined with a different one of the sets of performance data determined for each of the CDEs thereby denoting measured performance for the CDE. Using the sets of performance data, it is determined whether any of the one or more other CDEs each simulating data caching has better performance than the first CDE.

Evaluating and selecting data caching techniques

A technique for managing storage in a data storage system includes ingesting host data into a data log backed by pages in a cache. The host data are addressed to specified locations in a data object stored in persistent storage devices. When mapping pages in cache to respective target locations in the persistent storage devices, a flag is selectively asserted to indicate whether there is contiguous free space at the target locations. The cache responds to the flag by delaying flushing of flagged pages, which provides more time for the cache to aggregate pages that map to contiguous free space. Meanwhile, pages that are not flagged can be flushed more quickly, enabling the cache to operate efficiently even though flushing of some pages is delayed.

Selectively delaying cache flushing to promote write efficiency

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Wilton, NH, United States of America

David John Agans