US 2022/0188235 A1 · DYNAMICALLY ADJUSTING PARTITIONED SCM CACHE MEMORY TO MAXIMIZE PERFORMANCE

Abstract

A method for dynamically adjusting cache memory partition sizes within a storage system includes computing a read hit ratio for data accessed in each cache partition and an average read hit ratio for all the cache partitions over a time interval. The cache memory includes a higher performance portion (DRAM) and lower performance portion (SCM). The method increases or decreases the partition size for each cache partition by comparing the read hit ratio for the partition to the average read hit ratio for all the partitions. Each cache partition includes maximum and minimum partition sizes, and read hit and read access counters. The SCM portion of the cache memory includes cache partitions reserved for storing data of a specific type, or data used for a specific purpose or with a specific software application. A corresponding storage controller and computer program product are also disclosed.

Claims20

Dependent claims

A computer program product for dynamically adjusting partition sizes within a storage system cache memory having a higher performance portion and a lower performance portion (SCM), the computer program product comprising a non-transitory computer-readable storage medium having computer-usable program code embodied therein, the computer-usable program code configured to perform operations when executed by at least one processor, the operations comprising:

reserving a plurality of cache partitions in the SCM, each of the cache partitions designated for storing data of a specific type or used for a specific purpose;
maintaining a read hit counter and a read access counter for each of the cache partitions during a time interval;
computing a read hit ratio for each of the cache partitions;
computing an average read hit ratio for the plurality of the cache partitions;
and
adjusting the partition size of each of the cache partitions based on the read hit ratio for the cache partition and the average read hit ratio for the plurality of the cache partitions.

3 more elements

A method for dynamically adjusting cache partition sizes within a storage system, the storage system including at least one processor, a cache memory having a higher performance portion and a lower performance portion (SCM), and a computer-readable storage medium having computer-usable program code embodied therein, the computer-usable program code configured to perform operations when executed by at least one processor, the method comprising:

reserving a plurality of cache partitions in the SCM, each of the cache partitions designated for storing data of a specific type or used for a specific purpose;
maintaining a read hit counter and a read access counter for each of the cache partitions during a time interval;
computing a read hit ratio for each of the cache partitions;
computing an average read hit ratio for the plurality of the cache partitions;
and
adjusting the partition size of each of the cache partitions based on the read hit ratio for the cache partition and the average read hit ratio for the plurality of the cache partitions.

3 more elements

A storage controller for dynamically adjusting cache partition sizes within a storage system, the storage controller including a processor, a cache memory having a higher performance portion and a lower performance portion (SCM), and a computer program product, the computer program product comprising a non-transitory computer-readable storage medium having computer-usable program code embodied therein, the computer-usable program code configured to perform operations when executed by the processor, the operations comprising:

reserving a plurality of cache partitions in the SCM, each of the cache partitions designated for storing data of a specific type or used for a specific purpose;
maintaining a read hit counter and a read access counter for each of the cache partitions during a time interval;
computing a read hit ratio for each of the cache partitions;
computing an average read hit ratio for the plurality of the cache partitions;
and
adjusting the partition size of each of the cache partitions based on the read hit ratio for the cache partition and the average read hit ratio for the plurality of the cache partitions.

3 more elements

Dependencies are inferred from the claim text.

Dynamically adjusting partitioned scm cache memory to maximize performance

Life of this patent

Dynamically adjusting partitioned scm cache memory to maximize performance

Life of this patent

Abstract

Claims20