Storage system and compression method

A data compression method for a storage system having a storage controller connected to a host and a plurality of nonvolatile memory drives connected to the storage controller,

• wherein the storage controller compresses a data from the host, provides the host with a first logical address space as a logical storage area, manages a before-compression data to be stored in the first logical address space, and manages an after-compression data to be written to a plurality of first physical address spaces that correspond to the first logical address space and that respectively manage storage areas of the plurality of nonvolatile memory drives,
• wherein each of the plurality of nonvolatile memory drives includes a nonvolatile memory, includes a second physical address space that manages a physical storage area of the nonvolatile memory and a second logical address space that corresponds to the second physical address space and that corresponds to each of the plurality of first physical address spaces, manages the after-compression data to be stored in the second logical address space, and writes the compressed data to the second physical address space,
• wherein the second logical address space and one of the plurality of first physical address spaces are managed with a common size and a common management size, and the first logical address space and the plurality of first physical address spaces are managed with a common size and a common management size, and
• wherein, in the first logical address space, the plurality of first physical address spaces, and a plurality of the second logical address spaces, leading addresses are aligned with the management size.