Abstract: To selectively use cost, performance, reliability, and security characteristics of storage devices in an appropriate manner. A storage system has a plurality of volumes of which reliability and security levels differ from one another, and a controller of the storage system determines a reliability requirement and a security requirement of a file based on at least one of a type and a content of the file, determines a volume to store the file based on the determination result, and stores the file in the determined volume.

Abstract: To selectively use cost, performance, reliability, and security characteristics of storage devices in an appropriate manner. A storage system has a plurality of volumes of which reliability and security levels differ from one another, and a controller of the storage system determines a reliability requirement and a security requirement of a file based on at least one of a type and a content of the file, determines a volume to store the file based on the determination result, and stores the file in the determined volume.

Abstract: A controller of a storage apparatus 200 of a storage system manages a storage device as a volume A 220 in which files are stored and volumes B to D 221 to 223 in which backup files of the files are stored. The volumes B to D 221 to 223 are configured by a plurality of physical storage devices with different performances. The controller classifies the volumes B to D 221 to 223 into a plurality of storage tiers Tier1 to Tier3 for management in accordance with the performances of the physical storage devices. The controller performs relocation of the storage tiers Tier1 to Tier3 in which the backup files are stored in consideration of a logical fault occurrence time point of the host at which detection of a defect of an application and/or a system of the host is used as a trigger.