Hitachi, Ltd.

Masahide Kawarasaki

Yusuke Nonaka

Shinichi Nakayama

Akira Nishimoto

Tetsuya Shirogane

Hitoshi Fukuguchi

Jin Choi

Takao Yoshikawa

A storage controller measures a RAID group (RG) operating time, which is the operating time of an RG. The storage controller then corrects the measured RG operating time, which is used to calculate the operating rate of the RG, on the basis of a correction coefficient associated with the type of the physical devices (PDEVs) constituting the RG, and on the basis of the RG backend multiplicity, which is the multiplicity of the I/O commands transmitted to the RG.

Storage system and storage system management method

In order to quickly perform maintenance or exchange of a controller of a storage device having an encryption function in a storage system, a first controller in a Ready state spoofs a second controller subjected to maintenance or exchange to acquire key information from a key management server and to store the information in a memory, and a second controller reads the key information from the memory of the first controller to store the information in an own memory to convert the second controller into a Ready state. Then, the first controller deletes acquired key information from an own memory to convert the controller into a Halt state.

Method for maintenance or exchange of encryption function in storage system and storage device

Data conversion processing for converting access target data into data of a different block size is executed without degradation of data input/output processing performance. A first controller manages its own load by associating it with LUs, which are access targets of an access requester; and if the first controller receives an access request from the access requester, it judges whether its load exceeds a threshold or not; and if its load exceeds the threshold, the first controller executes first data conversion processing for converting data relating to an access target LU(s) of the access requester from a first block size into a second block size or second data conversion processing for converting the data from the second block size into the first block size; and if its load is equal to or less than the threshold, the first controller gives a command to a second controller to execute the first data conversion processing or the second data conversion processing and the second controller executes the first data conversion processing or the second data conversion processing based on the command from the first controller.

Storage apparatus and its data processing method

Growing community of inventors

Tokyo, Japan

Masahide Kawarasaki