Hybrid storage

A storage system comprising:

• one or more solid state drive (SSD)-type storage devices;
• and
• one or more hard disk drive (HDD)-type storage device, a respective HDD-type storage device of the one or more HDD-type storage devices including:
• one or more HDD-type storage units;
• and
• a first control unit including:
• a first access information acquiring module that periodically acquires access information of one or more data blocks stored in the one or more HDD-type storage units;
• and
• a first storage location adjusting module that adjusts one or more storage locations of the one or more data blocks stored in the one or more HDD-type storage units according to the acquired access information of the one or more data blocks stored in the one or more HDD-type storage units.

One or more memories stored thereon computer-executable instructions executable by one or more processors to perform operations comprising:

• periodically acquiring access information of one or more data blocks stored in one or more storage devices;
• and
• adjusting one or more storage locations of the one or more data blocks in a storage system according to the acquired access information of the one or more data blocks, the adjusting including:
• migrating a first data block, whose number of accesses exceeds a first predetermined number of times, stored in a hard disk drive (HDD)-type storage device of the one or more storage devices to a solid state drive (SSD)-type storage device of the one or more storage devices;
• or
• migrating a second data block, whose number of accesses is less than a second predetermined number of times, stored in a SSD-type storage device of the one or more devices to a HDD-type storage device of the one or more storage devices.