Hitachi, Ltd.

Junichi Muto

Kazue Jindo

Isamu Kurokawa

Ran Ogata

Hisaharu Takeuchi

Shinichi Hiramatsu

Yoshihiro Asaka

Masaru Tsukada

Hidetoshi Sakaki

Akihiro Mori

Noboru Furuumi

Kazuhiro Murata

Masahiro Kawaguchi

Masami Maeda

Hiroaki Nakanishi

Jun Miyashita

Misako Tamura

Takuya Ichikawa

Akihiro' Mori

The present invention continues host access and holds data of a migration source volume as the latest data even when a fault occurs in any of a plurality of access paths. Upon receiving a first write command from a host computer via a first access path, the migration source controller writes first update data to the migration source volume and, upon receiving a second write command from the host computer via a second access path, the migration destination controller transfers second update data to the migration source controller via a storage path and, upon receiving the second update data from the migration destination controller, the migration source controller writes the second update data to the migration source volume.

Computer system and data migration method

Each actual page inside a pool is configured from a plurality of actual tracks, and each virtual page inside a virtual volume is configured from a plurality of virtual tracks. A storage control apparatus of a mainframe system has management information that includes information denoting a track in which there exists a user record, which is a record including user data (the data used by a host apparatus of a mainframe system). Based on the management information, a controller identifies an actual page that is configured only from tracks that do not comprise the user record, and cancels the allocation of the identified actual page to the virtual page.

Mainframe storage apparatus that utilizes thin provisioning

To efficiently manage data including control information. A storage apparatus connected to a host requesting data writing includes one or a plurality of storage devices and a controller for allocating a storage area in page units to an area of a virtual volume to write the data in response to a request from the host to write the data wherein if the data regarding which the host makes the write request includes control information and data excluding the control information is specified data, the controller releases the allocation of the page allocated to the area for writing the relevant data.

Storage apparatus and data management method

A storage apparatus comprises a disk device and a disk adapter for controlling the disk device. The disk adapter controls the disk device and forms a data volume and a pool volume, creates a data block for parity data, compresses write data and the created parity data, and stores a number of compressed data blocks equal to or less than a predetermined number and stores compressed parity data that are within a predetermined size in storage areas in an actual volume, and stores the remaining compressed data blocks of a number greater than the predetermined number and compressed parity data that exceed the predetermined size in storage areas in the pool volume corresponding to a virtual volume.

Storage apparatus and data storage method using the same

Proposed is technology for shortening the time required for analyzing and processing commands issued from multiple hosts and speeding up the processing. When a controller receives a command including random IO processing and the reception of commands is complete, it determines whether the valid extents prescribed in seek parameters attached to an LOC command overlap, and executes extent exclusive wait processing which causes access to the logical volume to enter a wait state or access processing to the logical volume based on the determination result. If the reception of commands is incomplete, the controller determines whether the access ranges (extents) designated in a DX command overlap, and executes extent exclusive wait processing or access processing to the logical volume based on the determination result.

Storage system and its multiple extent exclusive control method

A storage apparatus comprises a disk device and a disk controller for controlling the disk device. The disk controller provides a data volume including an actual volume and virtual volume with a volume capacity virtualization function. The virtual volume is associated with a pool volume for storing the actual data and the actual data is stored in the pool volume. In response to a write command from a host computer, the disk controller compresses write data under RAID 5 control and stores the compressed data in a storage area in the actual volume. If the entire compressed data cannot be stored in that storage area, the disk controller stores the remaining portion of the compressed data in the virtual volume.

Provided is a storage system enabling the addition of a storage apparatus without going offline. When a first storage apparatus receives from a host system a command for writing first data in any one of the primary volumes in a primary volume group, it writes the first data in the relevant primary volume and sends to a second storage apparatus a first command for writing the first data in a secondary volume specified using first mapping information. When the second storage apparatus receives from the host system a command for writing second data in any one of the secondary volume groups in a secondary volume group, it writes the second data in the relevant secondary volume and sends to the first storage apparatus a second command for writing the second data in a primary volume specified using second mapping information.

Storage system

In the host, an IP issues CCW, and a CH encodes the CCW and a CCW chain by the encode program to create a code including the description of controlling a conditional branch with the DKC and transmits the code to a PORT in the DKC. In the DKC, the PORT decodes the code by the decode program, and a CP sequentially processes each command obtained by the decoding and returns a return code representing the end state of the processing. The host receives the return code to recognize the end state of the processing.

Data processing system, data processing method and program

A storage system comprising a host device, a storage device, a switching device, and a management terminal is provided. The host device has a plurality of first logical blocks. The storage device has a plurality of second logical blocks. The switching device transfers data between the host device and the storage device through a plurality of paths. The management terminal receives information on the first logical blocks from the host device, receives information on the second logical blocks from the storage device, and generates information showing connecting paths between the first logical blocks and the second logical blocks based on the information on the first logical blocks received and the information on the second logical blocks received. Accordingly, it is possible to get hold of the connected configuration of the first logical blocks and the second logical blocks.

Method for managing computer system, computer executing management program, storage device, displaying device, and storage system

Disclosed is an information processing system including a first information processing apparatus having a first communication port for transmitting and receiving data; a second information processing apparatus having a second communication port for transmitting and receiving data; and a communicating portion for executing bi-directional communication between the first communication port and the second communication port, the information processing system comprising a utilizing portion for utilizing the communicating portion, for communication in a direction for which a first application program run on the first information processing apparatus sets the first communication port and the second communication port respectively as the sender and the destination of data; and a utilizing portion for utilizing the communicating portion, for communication in a direction for which a second application program run on the second information processing apparatus sets the second communication port and the first communication port respectively as the sender and the destination of data.

Information processing system, storage system, storage device controller and program that enable facilitating the recovery work of remote copying

A data look-ahead control is provided to realize a high cache hit rate and improves responsiveness in an information processing system. In the data look-ahead control, when it is determined that the current input/output request is an access to a specific database that was the subject of a recent input/output request and whose I/O count exceeds a predetermined value, and it is also determined that a cache memory can be occupied to some extent and that there would be no impact on other input/output requests, data including one or more blocks (logical tracks) larger than a block that is the subject of the current I/O request are loaded to the cache memory.

Effects of prefetching on I/O requests in an information processing system

A storage system, which can execute sort processing of data without affecting online service, is disclosed. A storage control devicereceives a sort instruction specifying a record group for sorting and a sort key from a host device, reads the record group from an external storage deviceinto cache memory, and uses the cache memoryand a work area secured in the external storage deviceto execute sort processing of the above record group, and again stores the sorted record group in a prescribed output area within the external storage device. When a plurality of sort instructions are received, work areas are allocated automatically without overlapping work areas. When record updates occur during online service, a snapshot of the updated records is taken, and sorting of the snapshot is performed.

Growing community of inventors

Odawara, Japan

Junichi Muto