A storage device includes: at least one nonvolatile memory device configured to store or read data; and at least one controller configured to: control the at least one nonvolatile memory device, perform at least one workload of a plurality of workloads, based on at least one parameter, perform a tuning for improvement of a performance and a Quality-of-Service (QOS) conformity with a first storage device associated with the workload, and wherein the at least one controller is further configured to individually perform the tuning for each of the plurality of workloads that are different kinds.