Abstract: An object of the present invention is to properly secure the consistency of data while suppressing a processing load of a controller on a processor. A storage system includes a plurality of controllers and an HCA that can directly access a memory and can communicate with the controllers. The controller includes a CPU, and a memory having a buffer region into which data is temporarily stored and a cache region into which data is cached. In the case where new data according to a write request is stored into the buffer region, the CPU of the controller sequentially transfers the new data to the cache regions using the HCA without passing through the other buffer regions.

Abstract: In technique for dividing ECC large in size, plural ECCs of different sizes are required to be managed and control over storage areas of NVM is intricate. In addition, a relatively reliable page (a minimum record unit) and a relatively unreliable page are determined beforehand depending upon which recording method is adopted. However, as dispersion exists in quality among NVMs, it may occur among NVMs that dispersion in an error bit count is great among pages of the same reliability. An NVM controller in a nonvolatile memory (NVM) module divides the ECCCW into N pieces (N: two or a larger integer) of ECCCW portions and records the N pieces of ECCCW portions in N pieces of storage areas out of plural storage areas in one or more NVMs configuring an NVM section.

Abstract: In technique for dividing ECC large in size, plural ECCs of different sizes are required to be managed and control over storage areas of NVM is intricate. In addition, a relatively reliable page (a minimum record unit) and a relatively unreliable page are determined beforehand depending upon which recording method is adopted. However, as dispersion exists in quality among NVMs, it may occur among NVMs that dispersion in an error bit count is great among pages of the same reliability. An NVM controller in a nonvolatile memory (NVM) module divides the ECCCW into N pieces (N: two or a larger integer) of ECCCW portions and records the N pieces of ECCCW portions in N pieces of storage areas out of plural storage areas in one or more NVMs configuring an NVM section.