Hitachi, Ltd.

Toyo Seikan Group Holdings, Ltd.

Atsushi Ebata

Yoshiko Yasuda

Jun Okitsu

Shinichi Kawamoto

Tatsuo Higuchi

Seishi Yoshikawa

Koki Shibata

Takeshi Kato

Atsushi Sutoh

Takayuki Ishihara

Michitaka Yamamoto

Kenya Majima

Kouki Shibata

The layered body for packaging of the present invention includes a barrier film () having an inorganic coating () formed on the surface of a thermoplastic resin film (), and an adhesive layerprovided on the inorganic coating (). The adhesive layer () is formed of an epoxy-based adhesive.

Layered body for packaging

A propylene-based resin composition including an impact polypropylene component (A), and a linear low-density polyethylene component (B) containing methylpentene as a comonomer, the composition being characterized by containing a xylene-soluble fraction in an amount of 8 mass % or higher, and having an intrinsic viscosity measured for the xylene-soluble fraction is in a range from 1.0 to 2.9 dL/g.

Propylene-based resin composition and film for heat sealing

A system includes at least a user and a file system connected to the user through a network. An estimated write size of a write operation of the user into the file system is managed as an accumulated value. The timing of judging the limit of the disk usage amount is specified from the accumulated value and a predetermined threshold value, and the limit of the disk usage amount is judged at the specified timing, so that disk usage amount by a user may be limited and managed.

Method of controlling total disk usage amount in virtualized and unified network storage system

A processor of a management computer acquires the free disk space amount of a disk pool, acquires the invalid disk space amount from a plurality of host computers, determines a host computer to which the instruction for the physical disk space collection is issued on the basis of the invalid disk space amount, and judges that the free disk space amount is smaller than a predetermined threshold value before transmitting a GC control request to the determined host computer; another processor generates and transmits invalid disk space position information indicating the position of the invalid disk space in a virtual volume in cases where a host investigation request is received; and the other processor collects the physical disk space of a physical disk allocated to the storage disk space of the virtual volume in the disk pool.

Computer system and garbage collection method of disk space

A system according to this invention converts a full-copy snapshot into a differential snapshot. The system is composed of a storage subsystem and a server subsystem. The storage subsystem comprises a disk drive and a disk controller. The server subsystem comprises an interface, a processor, and a memory. The disk controller provides storage areas of the disk drive as logical volumes, and stores a differential block bitmap. The processor obtains the differential block bitmap, and identifies a block from the differential block bitmap. The processor obtains, from a full-copy snapshot volume, differential data that is stored in the identified block. The processor stores the obtained differential data in a differential volume. The processor stores, in differential block arrangement information, the location of the differential data stored in the differential volume.

Snapshot format conversion method and apparatus

A method for moving files between network storages in a virtualized network storage system having multiple network storages and rebalancing the free disk spaces. It periodically judges whether to start rebalancing. Two different conditions are adopted for the determination of start: (a) an imbalance of free disk spaces and the minimum value of the free disk spaces is less than a threshold and (b) an imbalance of free disk spaces and the frequency of accesses to the system is less than a threshold. Rebalancing is performed until the difference in free disk spaces falls below the threshold without exceeding the maximum execution time of rebalancing. If a request to write into a file which is being moved from a client takes place during a file moving step, the movement of the file is aborted and the file is deleted from the destination.

Method for rebalancing free disk space among network storages virtualized into a single file system view

A virtualizing file system view method for virtualizing one or more network storage devices into a virtualized file system view network storage system wherein destination network storage information of stored files is compactly held regardless of the number of files, and files are separated into one or more file groups and the file groups managed in destination network storage units. Until now, managing network storage unit information in individual files was necessary however the virtualizing file system view method reduces the management information that must be held and efficiently utilizes network storage capacity without holding destination network storage information in individual files. The cost of rewriting information is also lowered during structural changes such as adding or deleting network storage units since storage destination network information can be rewritten in file groups.

System and method for virtualizing network storages into a single file system view

A file replication method which allows, between a plurality of virtualized-and-unified file systems, real-time creation of a partial copy of that one of the virtualized-and-unified file systems as a target of replication is provided. The replication-source virtualized-and-unified file system is provided with a unified management directory for managing a structure of files and directories and the attribute information thereof, replication information for setting the file as an object to be copied, a request reception unit for receiving a request from a client in a unified manner, and a replication unit for judging whether or not replication should be performed in accordance with the unified management directory and the replication information and simultaneously transferring, based on the result of the judgment, the file access request to the replication-source virtualized-and-unified file system and to the replication-destination virtualized-and-unified file system.

File replication method for distributed file systems

A system and method for virtualizing a new network storage additionally installed and an existing network storage as a single file system by inheriting a directories tree structure from the existing network storage, wherein a virtualizing system of the new network storage has the function of reading out setup information of the existing network storage according to an expansion request from the administrator, registering the existing network storage as a member of the virtualizing system, copying a directories tree structure of the existing network storage, and swapping setup information of the existing network storage and that of he new network storage with each other.

Provided is a technique which solves a problem of a long-time reduction in a service level after service restoration and a problem of a failure caused by a disk capacity shortage during primary volume restoration. According to the technique, reference is made to a differential block management unit () setting which of a differential volume () and a primary volume () a data block of a restoring source snapshot volume (VVOL No.) is to determine which of the primary volume () and the differential volume () a volume storing read data is. When a restoring target data block is in a differential volume (), data of the differential volume () is restored in the primary volume (). Upon accessing to the primary volume () while restoring, switching is made to a virtual primary volume after restoration where data of the primary and differential volumes are combined based on the snapshot volume (VVOL No.) to execute accessing.

Method for restoring snapshot in a storage system

In an information processing apparatus which executes micro programs having branch instructions, two micro instructions are read at once, each of which instructions comprises either a field for specifying the branch target address in the following Nth (N&gE;2) cycle from the reading cycle of the micro instruction, or a field for determining the termination of micro program in the following Nth (N&gE;2) cycle, and a control field for controlling the execution in the next cycle.

Growing community of inventors

Yokohama, Japan

Atsushi Ebata