Hitachi, Ltd.

Kiyohisa Miyamoto

Akihiro Mori

Masashi Kimura

Mamoru Sato

By the same method as that of making data access to a data storage area in an online state, it is performed to access a data storage area other than the data storage area. A plurality of logical volumes carried by a disk array apparatus includes an online volume that is in an online state to a host and an offline state that is in an offline state to the host. The host transmits an access command including target information designating a target volume to the disk array apparatus as an access command to a starting volume other than the target volume. The disk array apparatus receives the access command to the starting volume and offers the data access to the target volume on the basis of the target information carried by that access command to the host.

System for accessing an offline storage unit through an online storage unit

The lock construction portion of a storage system receives, from a hostor SVP, the number of hosts which is the number of hostsactually connected to the storage system, and the number of groups which is the number of storage device groups among a plurality of storage device groupsfor which access exclusion control must be performed. Based on the received number of hosts and number of groups, the lock construction portion controls for which storage device groups to provide control blocks, and the number of control sub-blocks to provide in different control blocks.

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Hiratsuka, Japan

Kiyohisa Miyamoto