Emc IP Holding Company LLC

Mark D Moreau

Owen Martin

Malak Alshawabkeh

Anoop Raghunathan

Earl Medeiros

Kaustubh S Sahasrabudhe

Dustin Hunt Zentz

Vladimir Desyatov

Sean B Reilly

Techniques for performing data movements may include tracking sets of I/O statistics for a extents, wherein each of the sets of I/O statistics characterizes I/O operations directed to a corresponding one of the extents having data stored on a first storage tier of first non-volatile storage devices; determining, in accordance with the sets of I/O statistics, a list that includes one or more of the extents qualified for promotion from the first storage tier to a second storage tier, wherein the second storage tier includes second non-volatile storage devices have a higher performance ranking that the first non-volatile storage devices of the first storage tier; selecting, from the list, a first extent to be promoted from the first storage tier to the second storage tier; and performing first processing that promotes only cached data of the first extent from the first storage tier to the second storage tier.

Caching and data promotion techniques

Determining storage of particular data in cache memory of a storage device includes using a first mechanism to determine when to remove the particular data from the cache memory and using a second mechanism, independent from the first mechanism, to inhibit the particular data from being stored in the cache memory independent of whether the first mechanism otherwise causes the particular data to be stored in the cache memory. The first mechanism may remove data from the cache memory that was least recently accessed. The second mechanism may be based, at least in part, on a prediction value of an expected benefit of storing the particular data in the cache memory. The prediction value may be determined based on input data corresponding to measured cache read hits (RH), cache write hits (WH), cache read misses (RM), cache write destage operations (WD), and prefetch reads (PR) for the particular data.

Optimizing cache performance with probabilistic model

A technique allocates storage from a plurality of storage pools of a data storage assembly to host storage. The technique involves receiving an allocation request and, in response to the allocation request, performing a set of probability-based allocation attempt operations that attempts to allocate a storage portion from one of the plurality of storage pools to the host storage. Each storage pool of the plurality of storage pools provides multiple storage portions of physical storage to store host data. The technique further involves, based on a result of the set of probability-based allocation attempt operations, provisioning the host storage with a storage portion from a particular pool of the plurality of storage pools to satisfy the allocation request.

Probability-based allocation of storage from storage pools

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Grafton, MA, United States of America

Mark D Moreau