Memory system for controlling nonvolatile memory

A memory system comprising a host device and an SSD, the SSD comprising a nonvolatile memory including a plurality of physical blocks and a controller electrically connected to the nonvolatile memory, the host device controlling the SSD by issuing commands, wherein

• the host device is configured to issue a request command for allocating the plurality of physical blocks as a plurality of namespaces, and
• based on the issued request command, the memory system is configured to:
• manage the plurality of namespaces, the plurality of namespaces including at least a first namespace for storing a first type of data, and a second namespace for storing a second type of data having a lower update frequency than the first type of data, the issued request command includes a first request for the first namespace and a second request for the second namespace, the first request specifying a first number of logical block addresses and a first number of physical blocks, the second request specifying a second number of logical block addresses and a second number of physical blocks;
• allocate the first number of physical blocks for the first namespace;
• allocate the second number of physical blocks for the second namespace;
• allocate a first over-provision area for the first namespace, wherein a remainder which is obtained when a capacity corresponding to the first number of logical block addresses is subtracted from a capacity corresponding to the first number of physical blocks serves as the first over-provision area;
• and
• allocate a second over-provision area for the second namespace, wherein a remainder which is obtained when a capacity corresponding to the second number of logical block addresses is subtracted from a capacity corresponding to the second number of physical blocks serves as the second over-provision area.

A memory system comprising a host device and an SSD, the SSD comprising a nonvolatile memory including a plurality of physical blocks and a controller electrically connected to the nonvolatile memory, the host device controlling the SSD by issuing commands, wherein

• the host device is configured to issue a request command for allocating the plurality of physical blocks as a plurality of namespaces, and
• based on the issued request command, the memory system is configured to:
• logically divide the nonvolatile memory into a plurality of areas, the plurality of areas being associated with the plurality of namespaces, the plurality of areas including at least a first area for storing a first type of data, and a second area for storing a second type of data having a lower update frequency than the first type of data, the first area and the second area being associated with a first namespace and a second namespace, the issued request command including a first request for the first namespace and a second request for the second namespace, the first request specifying a first number of logical block addresses and a first number of physical blocks, the second request specifying a second number of logical block addresses and a second number of physical blocks;
• allocate the first number of physical blocks for the first area;
• allocate the second number of physical blocks for the second area;
• allocate a first over-provision area for the first area, wherein a remainder which is obtained when a capacity corresponding to the first number of logical block addresses is subtracted from a capacity corresponding to the first number of physical blocks serves as the first over-provision area for the first area;
• allocate a second over-provision area for the second area, wherein a remainder which is obtained when a capacity corresponding to the second number of logical block addresses is subtracted from a capacity corresponding to the second number of physical blocks serves as the second over-provision area for the second area;
• write data associated with an ID of the first namespace to the first area as the first type of data;
• and
• write data associated with an ID of the second namespace to the second area as the second type of data.

A memory system comprising a host device and an SSD, the SSD comprising a nonvolatile memory including a plurality of physical blocks and a controller electrically connected to the nonvolatile memory, the host device controlling the SSD by issuing commands, wherein

• the host device is configured to issue a request command for allocating the plurality of physical blocks as a plurality of namespaces, and
• based on the issued request command, the memory system is configured to:
• manage the plurality of namespaces, the plurality of namespaces including at least a first namespace for storing a first type of data, and a second namespace for storing a second type of data having a lower update frequency than the first type of data, the issued request command including a first request for the first namespace and a second request for the second namespace, the first request specifying a first number of logical block addresses and a first number of physical blocks, the second request specifying a second number of logical block addresses and a second number of physical blocks;
• allocate the first number of physical blocks for the first namespace, the first namespace including a first over-provision area, wherein a remainder which is obtained when a capacity corresponding to the first number of logical block addresses is subtracted from a capacity corresponding to the first number of physical blocks serves as the first over-provision area;
• and
• allocate the second number of physical blocks for the second namespace, the second namespace including a second over-provision area, wherein a remainder which is obtained when a capacity corresponding to the second number of logical block addresses is subtracted from a capacity corresponding to the second number of physical blocks serves as the second over-provision area.