Storage device and global garbage collection method of data storage system including the same

A global garbage collection method of a data storage system including a plurality of storage devices and a storage controller controlling the plurality of storage devices comprising:

• configuring the plurality of storage devices as a redundant array of independent disks (RAID);
• storing RAID constitution information in each of the plurality of storage devices;
• receiving an input/output request from a host at a storage device from among a plurality of storage devices;
• determining whether a hot spare or an extra parity disk exists within the plurality of storage devices;
• and
• if neither the hot spare nor the extra parity disk is determined to exist,
• generating a global garbage collection command using the RAID constitution information stored in the storage device;
• and
• performing a global garbage collection in each of one or more other storage devices on the basis of the global garbage collection command and an internal state of each of the one or more other storage devices, respectively, the one or more other storage devices being the one or more storage devices from among the plurality of storage devices other than the storage device.

A storage device comprising:

• at least one nonvolatile memory device;
• and
• a memory controller configured to control the nonvolatile memory device, the memory controller including,
• at least one processor configured to control an operation of the memory controller;
• a buffer memory configured to store input/output data corresponding to an input/output request received at the storage device from an external device;
• and
• a garbage collector configured such that the garbage collector selectively sends a first global garbage collection command to one or more other storage devices in response to the input/output request, the first global garbage collection command instructing the one or more other storage devices to perform garbage collection operations at each of the one or more other storage devices, respectively.