Multi-tier storage and mirrored volumes

A computer program product comprising program instructions stored on a computer readable storage medium, wherein the computer readable storage medium is not a transitory signal per se, the program instructions executable by a processor to cause the processor to perform a method comprising:

• identifying a first data extent for promotion, wherein the first data extent is stored in a first storage pool of a multi-tier storage system (MTSS), based on a read-write heat mapping by the MTSS, wherein:
• the first data extent is a mirrored copy of a second data extent stored in a second storage pool of the MTSS;
• the first storage pool is asymmetric to the second storage pool;
• the first data extent is read-intensive;
• identifying the first data extent comprises determining that a number of READ operations performed on the read-intensive data extent exceeds a predetermined threshold the first data extent is associated with a mirrored volume;
• determining that a second top promotion tier of the second storage pool is faster than a first top promotion tier of the first storage pool, wherein the second top promotion tier comprises read-intensive storage;
• promoting the second data extent to the second top promotion tier based on the determination;
• and
• updating an I/O access policy to direct future I/O operations for the mirrored volume to the second data extent.

A system comprising:

• a computer processing circuit;
• and
• a computer-readable storage medium storing instructions, which, when executed by the computer processing circuit, are configured to cause the computer processing circuit to perform a method comprising:
• identifying a first data extent for promotion, wherein the first data extent is stored in a first storage pool of a multi-tier storage system (MTSS), based on a read-write heat mapping by the MTSS, wherein:
• the first data extent is a mirrored copy of a second data extent stored in a second storage pool of the MTSS;
• the first storage pool is asymmetric to the second storage pool;
• the first data extent is read-intensive;
• identifying the first data extent comprises:
• determining that a number of READ operations performed on the read-intensive data extent exceeds a predetermined threshold the first data extent is associated with a mirrored volume;
• and
• determining that a percentage of READ operations performed on the read-intensive data extent exceeds a predetermined threshold, wherein the percentage of READ operations comprises a number of the READ operations performed on the first data extent divided by a total number of I/O access operations performed on the first data extent;
• determining that a second top promotion tier of the second storage pool is faster than a first top promotion tier of the first storage pool, wherein the second top promotion tier comprises read-intensive storage;
• promoting the second data extent to the second top promotion tier based on the determination;
• and
• updating an I/O access policy to direct future I/O operations for the mirrored volume to the second data extent.