Hybrid log-structured array and allocated storage device

An apparatus for storing data on a data storage device, the apparatus comprising:

• an I/O processing module configured to:
• receive an I/O request to perform a data transfer operation involving the data storage device, wherein the data on the data storage device comprises data stored in special sectors and data stored in regular sectors, the special sectors stored as allocated sectors and the regular sectors stored as a log-structured array (LSA);
• determine, from content of the I/O request, a data transfer operation type;
• determine in response to the data transfer operation type being a read operation, a data transfer sector type;
• read, in response to the data transfer sector type being a special sector, a special sector from the LSA;
• and
• read, in response to the data transfer sector type being a regular sector, a regular sector from the allocated sectors;
• and
• determine, in response to the data transfer operation type being a write operation, a data transfer sector type;
• write, in response to the data transfer sector type being a special sector, a special sector to the LSA;
• and
• write, in response to the data transfer sector type being a regular sector, a regular sector to the allocated sectors.

A computer program product for storing data on a data storage device, the computer program product comprising:

• a computer-readable storage medium having program instructions embodied therewith, the program instructions executable by a computer to cause the computer to:
• receive an I/O request to perform a data transfer operation involving the data storage device,
• determine when a data transfer operation type in the I/O request is a read operation, a data transfer sector type;
• read, the data transfer sector type a special sector, a special sector from a log-structured array (LSA);
• and
• read, when the data transfer sector type is a regular sector, a regular sector from the-allocated sectors;
• and
• determine, the data transfer operation type in the I/O is a write operation, a data transfer sector type;
• write, when the data transfer sector type is a special sector, a special sector to the LSA;
• and
• write, when the data transfer sector type is a regular sector, a regular sector to the allocated sectors.