Hitachi, Ltd.

Yoji Sunada

Mitsunori Satomi

Satoru Kishimoto

Yoji Nakatani

Hodaka Furuya

Youji Nakatani

Tomohiro Shinohara

The present invention provides a storage subsystem capable of realizing efficient data migration and high access performance. During migration of data between storage subsystems, data migration methods are selected between a 'PUSH' type and a 'PULL' type method based on a data migration policy set in advance to perform data migration processes. An access characteristics of a file and a folder storing the file are determined based on a file access frequency or a final access date and time information in a migration source storage subsystem, and the migration order of a file group determined to have a high possibility of being accessed during data migration is changed between the &#x201c;PUSH&#x201d; type and the &#x201c;PULL&#x201d; type.

Storage system, computer system and data migration method

In a first file storage apparatus, a first controller, which manages a first file system comprising a plurality of files, transfers a copy of the first file to a second file storage apparatus when managing the first file, manages the copy of the first file as a first replication file, configures the replication destination of the first replication file in the first file as a first pointer and, when processing a second file as a de-duplication target file, manages the first replication file as a copy of the first file and second file, configures a first pointer in the second file, and deletes the first data on condition that the storage destination of the first data which comprises the first file has been configured in the first file, or deletes the second data on condition that the storage destination of the second data which comprises the second file has been configured in the second file.

Storage system and file management method

An information processing system includes a plurality of edge nodes to provide services relating to files, and a core node communicatively coupled to each of the edge nodes and configured to send or receive data of the files to or from the edge nodes and to manage the data of the files. Any one of the edge nodes is granted a first access right permitting update of the files, whereas any two or more of the edge nodes are granted a second access right to prohibit update of the files. The core node stores the access right granted to each of the edge nodes. When detecting that a failure has occurred in the edge node granted the first access right, the core node sends one of the edge nodes granted the second access right a first instruction to take over the first access right granted to the failed edge node.

Information processing system and method for controlling the same

It is an object of the present invention to allow easy upgrading of the version of the OS in a failover cluster system. When the user mounts a storage mediumon the node, and gives instructions to install a program, the installation programrequests the failover programfor the stopping of heartbeat communications. The nodevoluntarily stops heartbeat communications in a state in which the system of this node is operating normally. When the failover programof the nodedetects the stopping of heartbeat communications, this program starts failover, and takes over the business service of the node. During the execution of failover by the node, the program stored in the storage mediumis installed in the node. When this installation is completed, the nodetransmits a failback request to the node, and restarts the business service.

Growing community of inventors

Yokohama, Japan

Yoji Sunada