Hitachi, Ltd.

Toshiya Seki

Takashi Sakaguchi

Eiju Katsuragi

Takahiro Yamamoto

Koji Watanabe

Shintaro Inoue

Sadahiro Sugimoto

Tomohiro Yoshihara

Takashi Ochi

Noboru Morishita

Naoya Okada

Yoshihiro Yoshii

Takaki Matsushita

Yusuke Saito

Yutaka Ohshima

Katsuya Sato

Jun Miyashita

Tomohiro Nishimoto

Natsuki Kusuno

Kahori Sugihara

An amount of writing data to storage devices can be kept low in additional processing for solving the write hole problem. A storage system includes a computer(s), a nonvolatile storage device(s), and a high-speed storage device(s) which can be accessed at a higher speed than the above-mentioned storage device(s), and a drive log including write log information is recorded in the high-speed storage device. When the computer receives a write request for write data, the computer firstly performs drive log check processing and then performs data write processing. In the drive log check processing, if a redundant write log record is recorded in a drive log, the computer changes the write log status of the redundant write log record to 'completed' by targeting at the drive log and the write log information and then proceeds to the data write processing; and if the redundant write log record is not recorded in the drive log, the computer proceeds to the data write processing without changing the drive log or the write log information.

Storage system, storage management method, and storage management program

The storage system includes a controller and a storage drive accessible from the controller. The controller includes a memory and a processing unit. The memory includes a first cache area in which the writing of data by the storage drive is permitted, and a second cache area in which the writing of data by the storage drive is prohibited. A In the first cache area, the storage of data, by staging-in-advance in response to a read request for a sequential read, by the processing unit is permitted, and the storage of cache data in a dirty state by the processing unit is prohibited. In the second cache area, the storage of the cache data in the dirty state by the processing unit is permitted.

Storage system

To prevent an excessive increase of a dirty data amount in a cache memory. A processor acquires storage device information from each of storage devices. When receiving a write request to a first storage device group from a higher-level apparatus, the processor determines whether a write destination cache area corresponding to a write destination address indicated by the write request is reserved. When determining that the write destination cache area is not reserved, the processor performs, on the basis of the storage device information and cache information, reservation determination for determining whether to reserve the write destination cache area. When determining to reserve the write destination cache area, the processor reserves the write destination cache area. When determining not to reserve the write destination cache area, the processor stands by for the reservation of the write destination cache area.

Storage apparatus, recording medium, and storage control method

A storage control system reads a data set from a storage apparatus if necessary in response to an I/O request. A data set contains data and an address. The storage control system performs an all-type address check which is a check to determine whether one of a first address and second address which correspond to a read-target data set in address translation information, which is information indicating a mapping relationship between one or more first addresses and one or more second addresses, matches the address among the data and address contained in the data set. The one or more first addresses are each an address which belongs to the first address type. The one or more second addresses are each an address which belongs to the second address type. The storage control system performs processing according to the I/O request when the result of the all-type address check is true.

Storage control system and storage control method

Provided is a storage subsystem capable of speeding up the input/output processing for a cache memory. Microprocessor Packages manage information related to a VDEV ownership for controlling virtual devices and a cache segment ownership for controlling cache segments in units of Microprocessor Packages, and one Microprocessor among multiple Microprocessors belonging to the determined Microprocessor Package to perform input/output processing for the virtual devices searches cache control information stored in the Package Memory without searching the cache control information in the shared memory, and if data exists in the cache memory, accesses the cache memory, and if it does not, accesses the virtual devices.

Storage subsystem

The present invention reduces the amount of rebuild processing and executes a rebuild process efficiently. Multiple storage devices configure a parity group. Of the multiple storage devices, a prescribed storage device in which a failure has occurred is blocked. Each storage device stores management information. The management information manages from among the storage areas of the storage device a prescribed area having data from a higher-level apparatus. A controller determines whether a storage area of the prescribed storage device is the prescribed area based on the management information, and executes a rebuild process with respect to the area determined to be the prescribed area.

Storage control apparatus and storage control apparatus control method

A storage controller having a plurality of storage devices and a control circuit providing a plurality of virtual volumes, to each of which a storage area in a plurality of pool volumes provided with the plurality of storage devices can be mapped for writing data in response to a write access sent from an information processing apparatus to a logical area in one of the plurality of virtual volumes, respectively. The control circuit, according to a search of the plurality of pool volumes for a certain storage area in which a certain data pattern is written, releases the certain storage area from mapping to a logical area in the plurality of virtual volumes, so that the control circuit can use the released certain storage area for mapping to a virtual volume of the plurality of virtual volumes as a destination of another write access from the information processing apparatus.

Storage controller and storage control method

Access to various types of resources is controlled efficiently, thereby enhancing the throughput. A storage system includes: a disk device for providing a volume for storing data to a host system; a channel adapter for writing data from the host system to the disk device via a cache memory; a disk adapter for transferring data to and from the disk device; and at least one processor package including a plurality of processors for controlling the channel adapter and the disk adapter; wherein any one of the processor packages includes a processor for incorporatively transferring related types of ownership based on specific control information for managing the plurality of types of ownership for each of the plurality of types of resources.

Storage system and ownership control method for storage system

A storage controller having a plurality of storage device and a control circuit providing a plurality of virtual volumes, to each of which a storage area in a plurality of pool volumes provided with the plurality of storage devices can be mapped for writing data in response to a write access sent from an information processing apparatus to a logical area in one of the plurality of virtual volumes, respectively. The control circuit, according to a search of the plurality of pool volumes for a certain storage area in which a certain data pattern is written, release the certain storage area from mapping to a logical area in the plurality of virtual volume, so that the control circuit can use the released certain storage area for mapping to a virtual volume of the plurality of virtual volume as a destination of another write access from the information processing apparatus.

A storage controller of the present invention partitions and allocates a virtual memory area to each of a plurality of functions operating simultaneously. Microprocessors inside a higher-level communications controller can respectively execute a plurality of program products. A virtual memory created using a local memory is partitioned into a plurality of areas. The partitioned areas are allocated to the respective program products via queues.

Controlling virtual memory in a storage controller

A storage control technique with which, even if not data, but only its management information is deleted, a host system can recognize storage areas storing unnecessary data and so use them effectively. When a file system in the host system deletes the management information for data stored in a page in a pool volume, a control circuit writes '0' in all the areas in the deletion target page in response to a command from the host system. The control circuit then detects the page where '0' is written in all of its areas and releases it from allocation to the corresponding virtual volume.

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Odawara, Japan

Toshiya Seki