Abstract: Computer system comprising a first primary storage apparatus and a first secondary storage apparatus and a second primary storage apparatus and a second secondary storage apparatus, a first virtual volume of the second primary storage apparatus is externally connected to a first primary volume of the first primary storage apparatus, a total cache-through mode is configured as a cache mode in a case where a read command is supplied by the first host apparatus, unique information for the first primary volume is configured for the first virtual volume, a path to the first primary volume is switched from the first host apparatus to a path via the first virtual volume, and a second primary volume in the second primary storage apparatus is configured to form a copy pair with a second secondary volume in the second secondary storage apparatus.

Abstract: A source remote copy configuration in a source storage system is migrated to a destination storage system as a destination remote copy configuration. The destination primary storage apparatus of the destination storage system defines a virtual volume mapped to the primary volume provided by the source primary storage apparatus which is a storage area of the virtual volume; takes over a first identifier of the primary volume to the virtual volume; transfers, when the virtual volume receives an access request, the access request to the source primary storage apparatus to write data in the primary volume; and takes over the first identifier from the virtual volume to another primary volume provided by the destination primary storage apparatus, after completion of copy of data from primary volume of the source primary storage apparatus into primary volume of the destination primary storage apparatus and secondary volume of the destination secondary storage apparatus.

Abstract: A management server and a data migration method enabling a storage apparatus to be replaced while retaining data consistency and without halting access by a host apparatus are proposed.

Abstract: For first write request to a virtual volume, the first storage apparatus performs processing by a method of either a first write processing method that stores write data in a first logical volume associated with the virtual volume as well as transfers a first write request, to the second storage apparatus, for storing the write data in a second logical volume associated with the virtual volume of the second storage apparatus or a second write processing method that transfers a first write request, to the second storage apparatus, then selects a processing method according to a first IO load on a first area of the virtual volume of the first storage apparatus and a second IO load on the first area of the virtual volume of the second storage apparatus to perform a processing for the first write request.

Abstract: A management server and a data migration method enabling a storage apparatus to be replaced while retaining data consistency and without halting access by a host apparatus are proposed.

Abstract: Proposed are a computer system and an access restriction method which enable security and reliability to be improved. In a computer system that comprises a first storage apparatus which provides a first logical volume from/to which a host apparatus reads and writes data, and a second storage apparatus which provides a virtual second logical volume obtained by virtualizing the first logical volume of the first storage apparatus, to the host apparatus, first path information which relates to a path from the host apparatus to the second logical volume is registered in the first storage apparatus in association with the first logical volume of the first storage apparatus, and reservation of and access to the first logical volume is granted only for a reservation request and access request with matching path information from the host apparatus.

Abstract: The storage system includes a first storage subsystem having a first logical volume to be accessed by a host computer, and a second storage subsystem connected to the first storage subsystem and having a second logical volume to be mapped to the first logical volume. The first storage subsystem includes a memory having definition information for defining a plurality of logical paths that transfer, to the second logical volume, I/O from the host computer to the first logical volume, and a transfer mode of the I/O to the plurality of logical paths. At least two or more logical paths among the plurality of logical paths are defined as active, and the controller transfers the I/O to the at least two or more logical paths set as active.

Abstract: The storage system includes a first storage subsystem having a first logical volume to be accessed by a host computer, and a second storage subsystem connected to the first storage subsystem and having a second logical volume to be mapped to the first logical volume. The first storage subsystem includes a memory having definition information for defining a plurality of logical paths that transfer, to the second logical volume, I/O from the host computer to the first logical volume, and a transfer mode of the I/O to the plurality of logical paths. At least two or more logical paths among the plurality of logical paths are defined as active, and the controller transfers the I/O to the at least two or more logical paths set as active.

Abstract: A storage apparatus includes: a management unit for managing mapping, to a logical volume, of a second dynamically allocated storage area volume in an external storage apparatus, and also managing a management unit for a storage area in the second dynamically allocated storage area volume for storing data sent from the host computer; a volume creation unit for creating, when creating the first dynamically allocated storage area volume in accordance with an externally given command, the first dynamically allocated storage area volume by setting the management unit for the first dynamically allocated storage area volume based on a management unit for a storage area in the second dynamically allocated storage area volume; and a write data writing unit for writing, in accordance with a command from the host computer, the write data sent from the host computer to a storage area in a relevant second dynamically allocated storage area volume.

Abstract: A storage control system in which a first storage controller is connected to a storage device in a second storage controller and the first storage controller is configured to be able to read and write data from/to the storage device in the second storage controller in response to a request from a host device connected to the first storage apparatus, the first storage controller including: a controller for controlling data transmission and reception between the host device and the storage device in the second storage controller; and a cache memory for temporarily storing the data, wherein the controller sets a threshold value for storage capacity in the cache memory assigned to the storage device according to the properties of the storage device.

Abstract: A storage control system is provided where a first host system connected to a first storage controller can issue a control command to a second storage controller connected another host system. The first storage controller is connected to the second storage controller and the command is issued without providing the command to the other host system. The first storage controller has a virtual volume, a memory unit for storing information necessary for mapping the virtual volume to a logical device in the second storage controller, and attribute information for the logical device. The host system identifies the virtual volume as the logical device in the second storage controller and issues a control command to this logical device via the virtual volume.

Abstract: A first storage control system comprises a CHN connected to a LAN CN. The CHN comprises a NAS processor and I/O processor. The I/O processor judges whether all or a portion of block level data is to be stored in either a first storage control system or a second storage control system, on the basis of an I/O allocation control data which indicates which of either the first storage control system or the second storage control system the block level data is to be stored in. On the basis of the result of this judgment, the I/O processor transfers the block level data from the NAS processor, to at least one of the DKA and the CHF connected to the second storage control system.

Abstract: A virtualization system, including: at least one first port coupled to at least one host system; at least one second port coupled to a plurality of storage systems; wherein the virtualization system is capable to control to perform processes of splitting a relationship between the first virtual volume and the second virtual volume; storing first differential information identifying data of a first write request; write data of first write request to a storage area of the disk drives related to the first logical volume; storing second differential information identifying data of a second write request, the data of the second request being written after the splitting step, receiving a differential copying request; to copy differential data from the first virtual volume to the second virtual volume, or to copy differential data from the second virtual volume to the first virtual volume.

Abstract: A shared storage area of a plurality of storage virtualization apparatuses connected to a host apparatus and a storage subsystem stores device configuration information expressing a logical device configuration in the storage virtualization apparatuses. The logical device configuration is a relationship between an external storage device in the storage subsystem, a virtual device serving as a virtualized storage space of a storage resource provided by one or more of the external storage devices, and one or more logical storage devices constituting an internal storage device in the storage virtualization apparatus. A newly connected storage virtualization apparatus reads the device configuration information from the shared storage area, and writes the read device configuration information into a configuration information storage area of the storage virtualization apparatus.

Abstract: The storage system includes a first storage subsystem having a first logical volume to be accessed by a host computer, and a second storage subsystem connected to the first storage subsystem and having a second logical volume to be mapped to the first logical volume. The first storage subsystem includes a memory having definition information for defining a plurality of logical paths that transfer, to the second logical volume, I/O from the host computer to the first logical volume, and a transfer mode of the I/O to the plurality of logical paths. At least two or more logical paths among the plurality of logical paths are defined as active, and the controller transfers the I/O to the at least two or more logical paths set as active.

Abstract: A plurality of key information items with a fixed constitution are stored in a shared memory of a first storage control system. Each key information item corresponds with each of the types of a second storage control system and includes, in a predetermined location in the key information, an information element that indicates the location of a particular information item among the plurality of information items in the control system information. A microprocessor in a Fiber Channel Adapter of the first storage control system determines whether to form a logical path with the second storage control system on the basis of the key information and the control system information that is received from the second storage control system.

Abstract: A storage control system is provided where a first host system connected to a first storage controller can issue a control command to a second storage controller connected another host system. The first storage controller is connected to the second storage controller and the command is issued without providing the command to the other host system. The first storage controller has a virtual volume, a memory unit for storing information necessary for mapping the virtual volume to a logical device in the second storage controller, and attribute information for the logical device. The host system identifies the virtual volume as the logical device in the second storage controller and issues a control command to this logical device via the virtual volume.

Abstract: A storage apparatus includes: a management unit for managing mapping, to a logical volume, of a second dynamically allocated storage area volume in an external storage apparatus, and also managing a management unit for a storage area in the second dynamically allocated storage area volume for storing data sent from the host computer; a volume creation unit for creating, when creating the first dynamically allocated storage area volume in accordance with an externally given command the first dynamically allocated storage area volume by setting the management unit for the first dynamically allocated storage area volume based on a management unit for a storage area in the second dynamically allocated storage area volume; and a write data writing unit for writing, in accordance with a command from the host computer, the write data sent from the host computer to a storage area in a relevant second dynamically allocated storage area volume.

Abstract: A storage control system in which a first storage controller is connected to a storage device in a second storage controller and the first storage controller is configured to be able to read and write data from/to the storage device in the second storage controller in response to a request from a host device connected to the first storage apparatus, the first storage controller including: a controller for controlling data transmission and reception between the host device and the storage device in the second storage controller; and a cache memory for temporarily storing the data, wherein the controller sets a threshold value for storage capacity in the cache memory assigned to the storage device according to the properties of the storage device.

Abstract: A logical port L1, which is obtained by integrating switch ports in a switch 16 and storage ports in a storage 20, and an access path group connecting the switch port in the switch 16 to the logical device 46 in the storage 29 are associated with each other, and information indicating that the entrance of the logical port L1 serves as the entrance of access for a host computer 10 is provided to the host computer 10.