Snapshots in a hybrid storage device comprising a magnetic disk and a solid state disk

A hybrid storage device having a magnetic disk and a solid state disk, wherein the hybrid storage device is coupled to a computational device, and wherein the hybrid storage device comprises:

• a memory;
• and
• a processor coupled to the memory, wherein the processor performs operations, the operations comprising:
• maintaining one or more snapshots of data in the hybrid storage device having the magnetic disk and the solid state disk;
• and
• in response to determining that an incremental snapshot stored in the solid state disk is to be merged with a first snapshot stored in the magnetic disk, all blocks in the incremental snapshot stored in the solid state disk are copied onto the magnetic disk to overwrite oldest blocks present in the magnetic disk.

A computer program product, the computer program product comprising:

• a non-transitory computer readable storage medium having computer readable program code embodied therewith, the computer readable program code configured to perform operations, the operations comprising:
• maintaining one or more snapshots of data in a hybrid storage device comprising a magnetic disk and a solid state disk;
• and
• in response to determining that an incremental snapshot stored in the solid state disk is to be merged with a first snapshot stored in the magnetic disk, all blocks in the incremental snapshot stored in the solid state disk are copied onto the magnetic disk to overwrite oldest blocks present in the magnetic disk.