Hitachi, Ltd.

Ps Japan Corporation

Shinichi Nakayama

Yutaka Takata

Hiroshi Ogasawara

Nobuyuki Saika

Shizuo Yokohata

Naotaka Kobayashi

Jinichi Shikawa

Keishi Tamura

Homare Kanie

Katsuhiro Uchiumi

Youichi Gotoh

Tetsuya Shirogane

Ikuya Yagisawa

Takeshi Hashimoto

Akira Nishimoto

Akiyoshi Hashimoto

Yoshihito Nakagawa

Masahiro Kawaguchi

Jin Choi

Masahide Kawarasaki

Mitsutoshi Toyama

Yonggen Jin

Youichi Goto

Yuta Sekino

In order to quickly perform maintenance or exchange of a controller of a storage device having an encryption function in a storage system, a first controller in a Ready state spoofs a second controller subjected to maintenance or exchange to acquire key information from a key management server and to store the information in a memory, and a second controller reads the key information from the memory of the first controller to store the information in an own memory to convert the second controller into a Ready state. Then, the first controller deletes acquired key information from an own memory to convert the controller into a Halt state.

Method for maintenance or exchange of encryption function in storage system and storage device

The storage system according to the present invention has a function to encrypt write data from the host and store the same in a storage media. Further, validation information of write data is added to the write data during storage thereof, and the data having the validation information added thereto is encrypted and stored in the storage media. When starting the storage system or restoring the encryption key information, the encrypted data stored in the storage media is read from the disk and decrypted prior to receiving a data access request from the host, and validation of data is performed using the validation information added to the decrypted data, so as to determine whether the encryption key stored in a storage controller is valid or not.

Storage system and method for controlling storage system

In a storage system for performing data backup using a battery during blackout, when the blackout continues for a long time, problems such as the loss of volatile memory data due to the consumption of battery capacity and the difference in recovery time between controller units after power recovery occur during restarting of the system. The present invention solves the problems by selecting (a1) battery backup or (a2) saving of data in a nonvolatile device based on the battery capacity or setting of modes, and selecting (b1) inhibiting restart of the system or (b2) storing of data in the volatile memory to a nonvolatile memory means and performing access via write-through based on the remaining capacity of the battery when restarting the system after power recovery. Further, the system enables to increase and decrease the volatile memory capacity of the write area and mutually confirms synchronization of controller units and contents of volatile memories. Thereby, the system enables to prevent data loss and inconsistency of data.

Storage system, data backup method, and system restarting method of a storage system incorporating volatile and nonvolatile memory devices

A storage subsystem and a storage controller adapted to take advantage of high data transfer rates of fiber channels while offering enhanced reliability and availability and capable of connecting with a plurality of host computers having multiple different interfaces. A loop is provided to serve as a common loop channel having fiber channel interfaces. Host interface controllers (HIFC) connected to host computers having different interfaces permit conversion between the fiber channel interface and a different interface as needed. Control processors, shared by the host interface controllers, each reference FCAL (fiber channel arbitrated loop) management information to capture a frame having an address of the processor in question from among the frames passing through the loop. I/O processing is then carried out by the controller in accordance with a range of logical unit numbers (LUN) set in the captured frame.

Storage subsystem and storage controller having memory which stores management information indicating corresponding relations between processors and identifies of logical units

A storage device controlling apparatus includes: a plurality of channel controllers having a circuit board on which are formed a file access processing section receiving requests to input and output data in files as units from an information processing apparatus and an I/O processor outputting I/O requests corresponding to the requests to input and output data to a storage device; and a disk controller executing input and output of data into and from the storage device in response to the I/O requests sent from the I/O processors. In the storage device controlling apparatus, the disk controller performs a replication management processing whereby data is also written into a second logical volume to store a copy of the data in the second logical volume, when the data is written into a first logical volume.

Method of controlling storage device controlling apparatus, and storage device controlling apparatus

Disclosed is a rubber-modified styrene-based resin comprising a styrene-based polymer forming a matrix and rubber-like polymer particles dispersed in the matrix like islands, each of the rubber-like polymer particles having a cross sectional structure where the styrene-based polymer particles are contained like islands-sea, wherein the rubber-modified styrene-based resin is constituted of 1-10 wt % of the rubber-like polymer and 99-90 wt % of the styrene-based polymer; the particle-diameter of the rubber-like polymer particle falls within a range of 1.0 to 5.0 &#x3bc;m; and a value of (styrene-based polymer weight/rubber-like polymer weight) in a methylethylketone-insoluble matter of the rubber-modified styrene-based resin falls within a range of 0.5 to 1.5.

Rubber-modified styrene-based resin and light diffusion plate containing such resin

A disk array system includes storage devices, a storage device control unit, a connection unit being connected with the storage device control unit, channel control units, a shared memory, and a cache memory. Each channel control unit includes a first processor of converting file data, received through a local area network outside of the disk array system to which the channel control units belongs, into block data and requesting storage of the converted data in the plurality of storage devices and a second processor of transferring the block data to the storage devices through the connection unit and the storage device control unit in response to a request given from the first processor and is connected with the connection unit and the local area network.

Disk array system

A network storage system has a structure for notifying the data storage system of a fault in the file server, the storage system having means for sending fault notification data to an external maintenance center. The file server can detect a fault and transmit data regarding the fault to the storage control unit while specifying a predetermined logic unit of the storage control unit, and the storage control unit has a faulty part management table, a function for storing the fault-related data transmitted from the file server unit separately from the data exchanged with the computers, a function for detecting a fault other than the fault in the file server unit and for storing that data in the faulty part management table, and a function for transmitting all or part of the faulty part management table to an external unit.

Fault data exchange between file server and disk control device

A first storage controller has a multilayer memory hierarchy constructed by LDEV (logical device) connected from LUN, and VDEV (virtual device) connected to the lower order of the LDEV. At least one of the VDEVs is constructed by mapping the memory resources arranged in external storage controllers. The functions of a stripe, RAID, etc. can be added in the mapping. Various kinds of functions (remote copy, variable volume function, etc.) applicable to the normal internal volume can be also used in a virtual internal volume by using the external memory resource as the virtual internal memory resource so that the degree of freedom of utilization is raised.

Virtualization system for virtualizing disks drives of a disk array system

Storage subsystem and storage controller

Storage system and storage controller

Under a hetero-environment in which different sorts of disk-systems are mixed with each other, a data guaranteeing operation can be carried out. When a cache controller of a local disk system receives a data writing request from a host computer, the cache controller stores data into a local disk provided in a disk device group. The data received from the host computer is also transmitted to a remote disk system and is stored in a remote disk. The data stored in the remote disk is immediately read, and the data written in the remote disk is compared with the data written in the local disk. As a result, since a data guarantee operation on the remote side is processed by the local disk system instead of the remote disk system, a data guaranteeing operation when a remote copying operation is performed can be carried out even in the storage system under a hetero-environment.

Remote copy operation between different sort of storage system and storage device system

A channel adapter connected to a host has a local cache memory. The channel adapter duplexes and writes the write-data in the local cache memory in response to a data-write request from the host. Then, the channel adapter sends the write-completion to the host and transfers all of the write-data within the local cache memory to the main cache memory in asynchronous timing. The channel adapter manages directory information of the data within the local cache memory. In response to a data-read request from the host, the channel adapter checks whether the read-data hits or not in the local cache memory based on the directory information. If the read-data hits, the read-data is transferred from the local cache memory to the host.

Storage system and data caching method in the system

In a storage device controlling apparatus which includes: a plurality of channel controllers having a circuit board on which are formed a file access processing section receiving from an information processing apparatus requests to input and output data in files as units via a network and an I/O processor outputting to a storage device I/O requests corresponding to the requests to input and output data; and a disk controller executing input and output of data into and from the storage device in response to the I/O requests sent from the I/O processors, at least one of the channel controllers receives data specifying an assignment of a logical volume to the channel controller, the data being sent from the information processing apparatus, and stores the received assignment.

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Chigasaki, Japan

Shinichi Nakayama