Memory system and method for controlling nonvolatile memory

A method of controlling a nonvolatile memory including a plurality of nonvolatile memory dies connected to a plurality of channels, each of the nonvolatile memory dies including a plurality of blocks, the method comprising:

• classifying the plurality of nonvolatile memory dies into a first die group including a plurality of first nonvolatile memory dies and a second die group including a plurality of second nonvolatile memory dies different from the first nonvolatile memory dies;
• in response to receiving, from a host, a first write command designating a first region corresponding to the first die group, writing first data to be written to the first region to a first write destination block which is selected from one of the first nonvolatile memory dies;
• and
• in response to receiving, from the host, a second write command designating a second region corresponding to the second die group, writing second data to be written to the second region to a second write destination block which is selected from one of the second nonvolatile memory dies, wherein
• a group of free blocks belonging to the first die group is managed by a first free block pool corresponding to the first die group,
• a group of free blocks belonging to the second die group is managed by a second free block pool corresponding to the second die group,
• the first write destination block is allocated from the first free block pool,
• the second write destination block is allocated from the second free block pool,
• the first free block pool is a free block pool dedicated to a first data block pool managing each of blocks which belongs to the first die group and which holds valid data, and
• the second free block pool is a shared free block pool shared by a plurality of second data block pools managing respective blocks which belong to the second die group and which hold valid data.

A memory system connectable to a host, the memory system comprising:

• a nonvolatile memory including a plurality of nonvolatile memory dies connected to a plurality of channels, each of the plurality of nonvolatile memory dies including a plurality of blocks;
• and
• a controller configured to control the nonvolatile memory via the plurality of channels, wherein
• the controller is configured to:
• classify the plurality of nonvolatile memory dies into a first die group and a second die group such that each of the plurality of nonvolatile memory dies belongs to only one die group;
• in response to receiving, from the host, a first write command designating a first region corresponding to the first die group, write first data to be written to the first region to a first write destination block which is selected from the first die group;
• and
• in response to receiving, from the host, a second write command designating a second region corresponding to the second die group, write second data to be written to the second region to a second write destination block which is selected from the second die group,
• free blocks belonging to the first die group are managed by a first free block pool corresponding to the first die group,
• free blocks belonging to the second die group are managed by a second free block pool corresponding to the second die group,
• the first write destination block is allocated from the first free block pool,
• the second write destination block is allocated from the second free block pool,
• the first free block pool is a free block pool dedicated to a first data block pool, the first data block pool managing each of blocks which belongs to the first die group and which stores valid data, and
• the second free block pool is a shared free block pool shared by a plurality of second data block pools, the plurality of second data block pools managing respective blocks which belong to the second die group and which store valid data.

A memory system connectable to a host, the memory system comprising:

• a nonvolatile memory including a plurality of nonvolatile memory dies connected to a plurality of channels, each of the plurality of nonvolatile memory dies including a plurality of blocks;
• and
• a controller configured to control the nonvolatile memory via the plurality of channels, wherein
• the controller is configured to:
• classify the plurality of nonvolatile memory dies into a first die group and a second die group such that each of the plurality of nonvolatile memory dies belongs to only one die group;
• and
• in response to receiving, from the host, a copy command designating the first die group as a copy source and designating the second die group as a copy destination,
• (1) read valid data from a first block which is selected from the first die group;
• and
• (2) write the read valid data to a second block which is selected from the second die group.

A memory system connectable to a host, the memory system comprising:

• a nonvolatile memory including a plurality of nonvolatile memory dies connected to a plurality of channels, each of the plurality of nonvolatile memory dies including a plurality of blocks;
• and
• a controller configured to control the nonvolatile memory via the plurality of channels, wherein
• the controller is configured to:
• classify the plurality of nonvolatile memory dies into a first die group and a second die group such that each of the plurality of nonvolatile memory dies belongs to only one die group;
• in response to receiving, from the host, a first write command designating a first region corresponding to the first die group, write first data to be written to the first region to a first write destination block which is selected from the first die group;
• and
• in response to receiving, from the host, a second write command designating a second region corresponding to the second die group, write second data to be written to the second region to a second write destination block which is selected from the second die group, wherein
• free blocks belonging to the first die group are managed by a first free block pool corresponding to the first die group,
• free blocks belonging to the second die group are managed by a second free block pool corresponding to the second die group,
• the first write destination block is allocated from the first free block pool,
• the second write destination block is allocated from the second free block pool,
• the first free block pool is a shared free block pool shared by a plurality of first data block pools, the plurality of first data block pools managing respective blocks which belong to the first die group and which store valid data, and
• the second free block pool is a shared free block pool shared by a plurality of second data block pools, the plurality of second data block pools managing respective blocks which belong to the second die group and which store valid data.

A method of controlling a nonvolatile memory, the nonvolatile memory including a plurality of nonvolatile memory dies connected to a plurality of channels, each of the plurality of nonvolatile memory dies including a plurality of blocks, said method comprising:

• classifying the plurality of nonvolatile memory dies into a first die group and a second die group such that each of the plurality of nonvolatile memory dies belongs to only one die group;
• and
• in response to receiving, from a host, a copy command designating the first die group as a copy source and designating the second die group as a copy destination,
• (1) reading valid data from a first block which is selected from the first die group;
• and
• (2) writing the read valid data to a second block which is selected from the second die group.