Hitachi, Ltd.

Akihiko Araki

Sadahiro Sugimoto

Yusuke Nonaka

Akira Yamamoto

Masayuki Yamamoto

Yoshiki Kano

Masanori Takada

Masakuni Agetsuma

Jun Kitahara

Noboru Morishita

Naoya Okada

Takanobu Suzuki

Sachie Tajima

Akira Deguchi

Hiroaki Akutsu

Kenta Shiga

Makio Mizuno

Takaki Matsushita

Shintaro Kudo

Tomoki Sekiyama

A computer system includes a plurality of servers connected to each other via a communication line, each server including a memory and a processor, an OS program and a storage program. The storage program is executed by the processor, and one of the plurality of servers acts as a request source server while one of the other servers acts as a request destination server. When the request source server reads data from the request destination server, the processor of the request source server executes the storage program to transmit a data read request to the request destination server. The processor of the request destination server then executes a storage memory driver incorporated in the OS program to read the requested data from an own memory and transmit the read data to the request source server. The request source server then executes the storage program to acquire the data.

Computer system, processing method, and driver program

A computing system that can maintain reliability required of a storage program while causing the storage program to operate on an operating system (OS) is provided. A processor of the computing system executes an OS controlling a hardware device and a storage program operating on the OS and using the hardware device via the OS. The OS identifies an error status of the hardware device when receiving a notification of an error that has occurred to the hardware device, and notifies the storage program that operates on the OS of the error status when the error status satisfies a predetermined condition. The storage program determines error handling on the hardware device on the basis of the error status, and requests the OS to perform the determined error handling. The OS performs the determined error handling on the hardware device.

Computing system and error handling method for computing system

This storage system comprises a block interface, a block control unit, a file control unit, and shared memory. The file control unit and block control unit are coupled via a first memory-through path structured to pass through a first area of the shared memory, and via a second memory-through path structured to pass through a second area of the shared memory. The block control unit has a protocol control unit and a virtual driver; exchanges control information for the file control unit with the file control unit via the first memory-through path; uses the virtual driver to convert an I/O request passed from the file control unit via the second memory-through path and processes the result with a protocol processing unit; and bypasses the virtual driver and uses the protocol processing unit to process a block I/O request transferred from the block interface via a physical path.

Storage system and storage control method

By assigning a physically continuous memory area to a virtual storage apparatus operated on an OS, the performance of the virtual storage apparatus is secured. A processor operates an OS, and the processor executes a plurality of processes on the OS. The plurality of processes includes a first virtual storage apparatus. The first virtual storage apparatus executes an I/O process, and includes a cache for storing data that is subjected to the I/O process. The processor assigns a resource in a computer to the plurality of processes, and the processor creates area information that indicates physical addresses assigned to the processes in a memory. On the basis of the area information, the processor selects a continuous area, which is a physically continuous area from the memory and assigns the continuous area to the cache.

Computer and control method for computer

When mounting hardware which is coupled to another portion by a plurality of paths with different applications, despite the hardware being a single device, and a failure occurs in any of the paths, there is a risk that the failure may propagate to other components unless the other paths are also blocked. In order to solve the problem described above, in a storage apparatus to which a device coupled by a plurality of coupling paths with different applications can be mounted, the present invention determines a block range at the time of an occurrence of a failure to be a device and a plurality of coupling paths coupled to the device, manages the block range, and upon an occurrence of a failure, executes failure handling which involves blocking an appropriate block range determined in advance by referring to the information.

Computer system and control method therefor for handling path failure

A storage controller has a processor, a volatile first cache memory that is coupled to the processor and that temporarily stores data, a nonvolatile second cache memory that is coupled to a microprocessor and that temporarily stores data, and a battery that is configured to supply electrical power to at least the processor and the first cache memory when a power stoppage has occurred. The second cache memory includes a dirty data area for storing dirty data, which is data that is not stored in the storage device, and a remaining area other than the dirty data area. When a power stoppage has occurred, the processor stores as target data in the remaining area of the second cache memory either all or a part of the data stored in the first cache memory.

Storage system

A storage system, which has a plurality of flash packages, has a function for minimizing the imbalance of the number of deletions of each block inside the flash packageand a block-unit capacity virtualization function, and efficiently manifests lessening of the imbalance of the number of deletions and reduction in the data storage capacity for the entire storage systemby having functions for calculating the number of deletions and the data occupancy of each flash package, and for transferring data between the flash packageson the basis of the values of these number of deletions and data occupancy.

Storage system having a plurality of flash packages

When a failure occurs in a storage system controller, the controller reboots after completing prescribed failure processing for respective control parts. Upon detecting a failure, first, second, and third control parts of the controller perform respective failure processing. The first control part controls block access requests, the second control part controls file system access, and the third control part manages the second control part. The first control part and third control part write prescribed information to a storage area and reboot at least a portion of the controller upon detecting the failure.

Storage system and storage system failure management method

The present invention aims at improving the performance of a compression function in a storage system, and solves the prior art problem of having to decompress a whole compression unit even if a read request or a write request targets only a portion smaller than the compression unit, causing increase of overhead of decompression processing and elongation of processing time, and deteriorating performance. The present invention prevents unnecessary decompression processing and reduces the overhead of processing by suppressing the range of decompression processing to a minimum portion according to the relationship between the read/write request range and the compression unit.

Method for decompressing data in storage system for write requests that cross compressed data boundaries

An embodiment of this invention divides a cache memory of a storage system into a plurality of partitions and information in one or more of the partitions is composed of data different from user data and including control information. The storage system dynamically swaps data between an LU storing control information and a cache partition. Through this configuration, in a storage system having an upper limit in the capacity of the cache memory, a large amount of control information can be used while access performance to control information is kept.

Storage system and management method of control information therein

Storage apparatus and data management methods provide for high-speed copying of a compressed data volume. A control unit of the storage apparatus divides a pool into a plurality of chunks including a plurality of pages storing data, compresses data which is written to a logical volume by a host, and assigns one of the plurality of chunks to a compressed data logical volume which stores the compressed data. When the compressed data logical volume is copied, the control unit makes a page length of the chunk assigned to the compressed data logical volume that is a copy source equivalent to a page length of the chunk assigned to the compressed data logical volume that is the copy destination.

Storage apparatus and data management method

The amount of data to be stored in a semiconductor nonvolatile memory can be reduced and overhead associated with data processing can be reduced. When a microprocessor receives a write request from a host computer and data Dto Dexist in a cache slot, the microprocessor reads the LBA of each piece of the data, manages each piece of the data Dto Dusing a bitmap table by associating them with their LBAs, generates a specific command CMD based on the LBAs of the data Dto D, adds the data Dto Dand addresses ADDto ADDindicating where the data Dto Dare to be stored, to the specific command CMD, and sends it to an FMPK. The FMPK stores each piece of update data in a specified block in the flash memory based on the specific command CMD.

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Yokohama, Japan

Akihiko Araki