Information processing apparatus, storage device, and method performed by host system

A storage device configured to communicate with a host system, the device comprising:

• a serial interface configured to support a plurality of link rates;
• a memory that stores information indicating a relationship between a maximum power consumption and a power consumption efficiency value for each link rate in first and second power throttling modes supported by the storage device, the first power throttling mode giving priority to performance of the storage device, the second power throttling mode giving priority to reduction of peak power of the storage device, the power consumption efficiency value being a value that corresponds to the number of I/Os per watt;
• and
• a controller configured to:
• receive from the host system via the serial interface an instruction to change a power throttling mode to one of the first and second throttling modes, which is selected by the host system based on the information and a user preference for performance of the host system, the user preference being one of:
• a first mode that gives priority to performance of the host system,
• a second mode that gives priority to reduction of power consumption of the host system, and
• a third mode that gives priority to reduction of peak power of the host system;
• and
• limit the maximum power consumption of the storage device based on the instruction received from the host system,
• wherein the controller is further configured to:
• store default capability information indicating the link rates supported by the storage device in a plurality of bits,
• mask bits in the plurality of bits that do not correspond to a range of link rates that starts at a minimum link rate of the storage device and ends at a maximum link rate specified by the host system, and
• transmit to the host system the masked plurality of bits.