Fujitsu Corporation

Motohiro Sakai

Akihito Kobayashi

Takuro Kumabe

Shinichiro Matsumura

Kazuma Takatsu

Keima Abe

Takahiro Ohyama

Akira Satou

Kenji Kobayashi

Atsushi Igashira

Hidefumi Kobayashi

Toshiharu Makida

Kiyoshi Sugioka

Satoshi Yazawa

Yusuke Inai

Wataru Iizuka

Shinya Hamano

A storage control device includes: an auxiliary cache memory that is a nonvolatile memory; a volatile memory; and a processor configured to execute a saving control process after a predetermined failure occurs, the saving control process being configured to (a) cause a writing control process to stop writing of data stored in the auxiliary cache memory to the storage medium, (b) secure, in the auxiliary cache memory, a storage region for storing the management information of the volatile memory, (c) generate a copy of management information of the volatile memory in the storage region, and (d) cause the writing control process to execute control to write first data stored in the volatile memory to the auxiliary cache memory or the storage medium based on the management information of the auxiliary cache memory.

Storage control device and non-transitory computer-readable storage medium for storing storage control program

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

A memory includes a plurality of pages used as a cache area. A processor allocates a first storage resource to a first link indicating a first page group of the plurality of pages, and a second storage resource to a second link indicating a second page group of the plurality of pages. The processor uses the first and the second links, and processes access requests for accessing to the first and the second storage resources, in parallel.

Storage control apparatus for managing pages of cache and computer-readable storage medium storing program

A storage control device includes a processor configured to receive from a host device a write request for writing data into a memory device. The processor is configured to try to write the data into a cache memory. The processor is configured to select an operation mode of a write process for the write request from among a first mode and a second mode on the basis of whether a cache hit or a cache miss occurs at the trial. The processor is configured to return a response to the host device upon completion of writing the data into the cache memory without waiting for completion of the write process when the write process is performed in the first mode. The processor is configured to return a response to the host device upon completion of the write process when the write process is performed in the second mode.

Storage control device for controlling write access from host device to memory 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

An operational management server manages a storage device that includes a plurality of types of disks having different performances. A setting unit sets a target value of a performance to a volume produced by using the different types of the disks. An allocation rate management unit determines allocation rates of the respective types of the disks included in the volume on the basis of the target value set by the setting unit, and instructs the storage device to reproduce the volume in accordance with the determined allocation rates.

Storage management apparatus, and performance adjusting method

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 tape library control apparatus includes a storage for storing configuration information, a diagnostic evaluator, and a command controller. A tape library apparatus includes may include a plurality of tape drives and a plurality of magnetic tapes which includes specific magnetic tapes assigned for respective pieces of data specified by each data request issued by a host computer and a common magnetic tape provided for writing the respective pieces of the data. The diagnostic evaluator determines a use mode of the tape library apparatus on the basis of the configuration information. When the total number of the specific magnetic tapes is higher than the number of available tape drives, the use mode is determined and a command is issued to the tape library apparatus from the command controller to write data to the specific magnetic tape and to write to the common magnetic tape the respective pieces of the data.

Tape library control apparatus and tape library control method

A storage system includes an interface processor for receiving a read or write request, a primary storage, a secondary storage, a storage control device and a temporary storage area for temporarily storing data for the primary storage in case that an access to the primary storage fails. The storage control device includes a controller for, in case that the access to the primary storage fails when the read request is received by the interface processor, determining whether the read requested data is stored on the temporary storage area, controlling to read the read requested data from the temporary storage area when the read requested data is stored on the temporary storage area, and controlling to read the read requested data from the secondary storage when the requested data is not stored on the temporary storage area.

Storage system, storage control device, and method

In a data recording apparatus, a monitoring unit detects a VLU including an MRB that manages an area that has not been accessed for a specified time period based on a current time, a time management table, and a parameter table. From MRBs of the detected VLU, the monitoring unit selects a plurality of MRBs with an unaccessed time period equal to or more than the specified time period and equal to or less than a total time. The monitoring unit performs synchronization process for data in a primary storage managed by the selected MRBs at a time. During the synchronization process, a correction value is adjusted when there is a data conflict with another device.

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Nerima, Japan

Motohiro Sakai