Hitachi, Ltd.

Toru Ando

Kiyoshi Honda

Yukiyoshi Takamura

Naoto Shiino

Tomohisa Ogasawara

Hidechika Nakanishi

Yuki Kotake

Keiichiro Uchida

A storage system has a storage controller and a RAID group. The storage controller has policy management information such that one failure recovery process among a plurality of differing failure recovery processes is associated with each RAID group, and when an error in a command issued to a RAID group is detected, the failure recovery process associated with the RAID group to which the command was issued is specified on the basis of the policy management information, and the specified failure recovery process is executed.

Storage system and storage management method

In a first system among first and second systems being a duplexed system as a path to a storage device, in a first SAS expander including a first port directly coupled to a storage device, buffer-on signifying that buffering is to be performed by the first SAS expander is configured with respect to the first port. In the second system, in a second SAS expander including a second port directly coupled to the same storage device, buffer-off signifying that buffering is not to be performed by the second SAS expander is configured with respect to the second port. By selecting any of the first system and the second system as a path of a command, whether or not the command is to be buffered by the first or second SAS expander directly coupled to a storage device serving as a destination of the command is determined.

Storage system and method for controlling command transmission

Growing community of inventors

Kanagawa, Japan

Toru Ando