Storage device for supporting multiple hosts and operation method thereof

A storage device comprising:

• a nonvolatile memory device;
• and
• a storage controller connected to a host including a first host and a second host and configured to control the nonvolatile memory device, wherein the storage controller includes:
• a first NVMe controller configured to process a first command from a first group of submission queues of the first host;
• a second NVMe controller configured to process a second command from a second group of submission queues of the second host;
• and
• a performance manager configured to:
• set a first weight value and a second weight value respectively associated with the first NVMe controller and the second NVMe controller based on first performance information received from the first and second performance information received from the second host,
• select a submission queue of a plurality of submission queues including the first group of submission queues and the second group of submission queues based on an aggregated value table including a plurality of entries, each of the plurality of entries being associated with a corresponding submission queue of the plurality of submission queues and updated based on a weight value of the corresponding submission queue and input/output (I/O) information processed by a command previously fetched from the corresponding submission queue, and
• process a command from the submission queue selected from the plurality of submission queues.

An operation method of a storage device which is configured to communicate with a plurality of hosts, the method comprising:

• receiving a plurality of performance information from the plurality of hosts;
• setting a weight value of each of the plurality of hosts based on respective performance information of the plurality of performance information;
• fetching a command from a first host of the plurality of hosts, based on an aggregated value table;
• processing the fetched command;
• and
• updating the aggregated value table based on input/output (I/O) information of the processed command and a weight value of the first host,
• wherein the aggregated value table includes a plurality of aggregated values, each of the plurality of aggregated values being previously updated by a product of I/O information of a previously processed command and a weight value of a host, from which the previously processed command was fetched, of the plurality of hosts.