Fujitsu Corporation

Akihito Kobayashi

Koji Uchida

Motohiro Sakai

Katsuhiko Nagashima

Kazuhiko Ikeuchi

Mikio Ito

Shinichi Nishizono

Takuro Kumabe

Shinichiro Matsumura

Hidenori Yamada

Takahiro Ohyama

Hidejirou Daikokuya

Kazuma Takatsu

Hidejiro Daikokuya

Shinya Mochizuki

Masahiro Yoshida

Hideo Takahashi

Akira Saito

Chikashi Maeda

Kazuo Nakashima

Atsushi Igashira

Tadashi Matsumura

Yukari Tsuchiyama

Hidefumi Kobayashi

Koutarou Nimura

Hideki Yamanaka

Kazuhiro Urata

Guangyu Zhou

Satoshi Yazawa

Hideaki Omura

Osamu Kimura

Sanae Kamakura

Keima Abe

Taichi Ohno

Wataru Iizuka

Takaaki Saito

A storage control device includes a processor configured to receive access information indicating a start position and an end position of an access area in a first volume. The processor is configured to determine, based on one or more pieces of the received access information, whether a number of blocks in a cache area is reduced as a whole by changing a position of data in the first volume. The blocks are used in response to an access to the access area and correspond to one or more unit areas in the first volume. The one or more unit areas include the access area. The processor is configured to change the position of the data in the first volume upon determining that the number of the blocks in the cache area is reduced as a whole by changing the position of the data in the first volume.

Storage control device

When an access process has been requested for a storage apparatus, a registration unit determines an access priority of the requested access process and registers an entry corresponding to the requested access process in a queue corresponding to the determined access priority out of a plurality of queues that are each provided for a different access priority. An instruction unit checks the plurality of queues at intermittent check timing, fetches, at each check timing, one entry from each queue, out of the plurality of queues, in which entries are registered, and instructs the storage apparatus to execute access processes corresponding to the fetched entries.

Storage control apparatus and storage control method

A first control apparatus includes a first memory unit including a local cache, a first power supply that supplies electric power to the first memory unit, and a control unit. The control unit controls a write into a memory device by a write-back method, using the local cache. The control unit mirrors data of the local cache in a mirror cache of a second control apparatus. The control unit determines whether the mirror cache is included in a second memory unit that receives electric power from a second power supply of the second control apparatus, upon detecting an abnormal state of a battery for supplying electric power to the second memory unit in case of power outage of the second power supply. The second memory unit switches write control for the memory device to a write-through method, when the second memory unit includes the mirror cache.

Storage system and control apparatus

A control device includes a processor. The processor is configured to collect plural types of performance information regarding a first data unit. The processor is configured to determine, on basis of the collected plural types of performance information, whether to transfer the first data unit from a first storage device which is under control of a first controller to a second storage device which is positioned as higher than the first storage device. The processor is configured to transfer the first data unit from the first storage device to the second storage device depending on a result of the determination.

Control device and storage system

A control unit stores data used in a process to a shared cache memory. The control unit provides a shared queue in a memory space of the shared cache memory and performs LRU control with the use of the shared queue. The control unit also provides a local queue in the memory space of the shared cache memory. The control unit enqueues a CBE (management information) for a cache page used by a core in a process to the local queue. The control unit dequeues a plurality of CBEs from the local queue upon satisfaction of a predetermined condition, and enqueues the dequeued CBEs to the shared queue.

Apparatus and method for controlling shared cache of multiple processor cores by using individual queues and shared queue

An apparatus includes a first cache memory, a second cache memory, and a processor coupled to the first cache memory and the second cache memory, and configured to store data in the second cache memory, the data being deleted from the first cache memory, store first data stored in a first address of the storage device, in the second cache memory, in case where the first address is included in first management information and is not included in second management information, according to a request for access to the first address of the storage device, the first management information including an address in the storage device of specific data stored in the storage device, and the second management information including an address in the storage device of data stored in both of the second cache memory and the storage device, and register the first address in the second management information.

Storage control device controlling access to a storage device and access controlling method of a storage device

A storage control apparatus is communicatively connected to a storage device. The storage device includes a plurality of SSDs. The storage control apparatus includes a processing request controller and a device load detector. The device load detector detects an overload of an SSD by detecting a processing delay of the SSD. When the device load detector has detected an overload of an SSD, the processing request controller suppresses issuance of a request to process write-back with respect to a group by delaying issuance of the write-back.

In a storage apparatus, in the case where a data block to be written to a storage medium is a zero data block containing only zero data, a zero data information memory stores zero data identification information indicating that the data block is a zero data block. A control apparatus receives a data block from an access requesting apparatus in association with a write request issued by the access requesting apparatus for writing the data block a specified number of times to a predetermined storage area of the storage medium, and when determining that the data block is a zero data block containing only zero data, sets zero data identification information in the zero data information memory, and when completing the setting of the zero data identification information, sends the access requesting apparatus a completion notice of the writing to the storage medium.

Control apparatus and method, and storage apparatus

A virtual storage device including a releasable region decider that decides whether each of a plurality of management unit regions is a releasable region, being allocated a physical region and being a release candidate region, by referring to management data that associates allocation data representing a state of allocating a physical region to the management unit region and release candidate region data representing whether the management unit region is a release candidate region with each other; a determinator that determines whether the management unit region decided to be the releasable region by the releasable region decider is an all-zero region all data in which are zero; and a releaser that releases allocation of a physical region allocated to the management unit region determined to be the all-zero region by the determinator. This configuration makes it possible to efficiently use the storage region.

Virtual storage device, controller, and computer-readable recording medium having stored therein a control program

A storage controller and method are provided. The storage controller includes control sections including storage sections into which data transmitted from a host unit is cached, one of the control sections being a main control section which controls firmware update in the control sections. The main control section includes an instruction updater sending an update instruction to a sub control section in the control sections in which firmware is to be updated, and an area instructor requesting the sub control section to transmit area information, the sub control section including an area information obtainer obtaining, according to the instruction from the area instructor and an area information transmitter transmitting to the area instructor; and an area setter setting the location of the cache area in the storage section on the basis of the instruction.

Storage controller and firmware updating method

A storage apparatus includes a copy control unit for managing a copy session for copying an copy source data area in at least one of the first to the Mth copy source disk groups to an copy destination data area in a corresponding copy destination disk group, setting a first to an Mth copy session groups, each of the copy session groups including one or more copy sessions from the ith copy source disk group to the ith copy destination disk group as the copy session, and performing repeatedly a selection operation for cyclically selecting a copy session from each of the first to the Mth copy session groups in a predetermined sequence and a control operation for cyclically executing copy processing on a predetermined copy processing unit basis for the M copy sessions selected by the selection operation in a predetermined sequence for a prescribed number of times.

Storage apparatus and storage control apparatus

A RAID control apparatus and control method. The RAID control apparatus includes disk devices and disk control devices including a cache memory that stores cache data of a logical unit, and control unit, upon the logical units present in different disk devices being concatenated to each other, switching in-charge disk control devices such that a disk control device is in charge of access to the concatenated logical units without writing back the cache data stored in a cache memory of a source disk control device to the disk device.

RAID control apparatus and control method therefor

A cache managing unit creates a list of elements corresponding to each data block arranged based on a priority of writing data blocks to a magnetic disk apparatus, and when a group of elements corresponding to data blocks to be written to the same magnetic disk apparatus exists, provides a link connecting elements at both ends of the group. A write control unit searches, upon selecting a data block for writing, elements belonging to the list in descending order of priority, and if a link is set at an element corresponding to a data block to be written to a magnetic disk that cannot perform a writing, follows the link to search a subsequent element.

Raid apparatus, cache management method, and computer program product

A system creates a configuration definition table to be used for accessing a physical disk according to a host I/O request, to decrease a memory size of the configuration definition table even if common firmware is used for models with different scales. For this, a model correspondence table to show the definition of each model is provided in a configuration setup processing module, the maximum values of this model are recorded in a memory based on this content, and a memory area for each item is secured. And the actual content of the configuration definition is developed on the secured memory. Therefore even for a diversity of models, the memory size of the configuration definition table can be decreased to a size matching the model, with common firmware regardless the model.

Configuration definition setup method for disk array apparatus, and disk array apparatus

A RAID apparatus that at least duplicates identical data to store thus duplicated data, which, when an instruction of writing data is given, writes data to a local cache and to a mirror cache, and writes data of the local cache to a primary disk and writes data of the mirror cache to a secondary disk. When an instruction of reading out data is given, and specified data is retained in the caches, the RAID apparatus outputs valid data of the local cache or the mirror cache, while when specified data is not retained in the caches, the RAID apparatus outputs valid data of the primary disk or the secondary disk.

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Kawasaki, Japan

Akihito Kobayashi