Abstract:
PROBLEM TO BE SOLVED: To provide a device, a method and a program, allowing a business restart in a standby system site when a master storage comprises a plurality of storages, or is made virtual. SOLUTION: Replication of master storages 1a, 1b and replica storages 2a, 2b is performed through this arbitration device 3, and the arbitration device 3 controls transmission of update information to make order of update in the replica storage proper. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To restore data up to a failure occurrence time in a remote site at high speed without placing a burden on a host. SOLUTION: A first storage system on a master side processes an input and output request from a host, transmits update data as a result of of input and output processing to a second storage system on a remote side. The second storage system holds the data received from the first storage device as updated log data. The host transmits a command for determining the state of an application as data to the first storage system, and the first storage system transmits these data to the second storage system. Both the host and the second storage system hold an identifier corresponding to the command while associating the identifier with log data. The host instructs the command, whereby the data at an optional time are restored in the second storage system. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To perform data transfer or data duplication between a plurality of storage systems, without affecting the computer of higher order of a storage system. SOLUTION: Two or more sub-storage systems 100B and 100C are connected to a main storage system 100A connected to a device 180 of higher order. The sub-storage systems 100B and 100C read data-updated journals from the main storage system 100A in their unique timings, and stores them into predetermined logical volumes JNL2 and JNL3 and generates the duplication of the data in the main storage system 100A, based on the journals in the logical volumes JNL2 and JNL3 with their unique timings, and stores them into sub-logical volumes COPY1 and COPY3. The main storage system 100A stores the journals until both sub-storage systems 100B and 100C read and restore the journals. The journal reading timing is controlled, according to the journal amounts and processing loads or the like. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To enable reference to the latest file data by making update contents reflect to a file system of a remote site in real time in conformity with updating in a local site, in a storage system for performing remote copy. SOLUTION: The storage system B comprises: a disk device having a disk drive, disk control part and disk cache; a file server having a CPU and main memory; and an interface for transferring data with the disk device of other storage system A through a communication line. This arrangement makes it possible to refer to the management information history 46 of files in the disk device, to update the management information 47 of files in the file server in response to file updating performed by the other storage system, and to transfer the user data 48 after updating to a readout request from a client connected to the storage system. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To solve a problem that duplication of data to a host base remote site causes a load on a host. SOLUTION: Actual data transfer is performed between storage devices at each site, and control etc. are performed by the host. Thereby, the data can be reproduced at the remote site even in a more complicated system without applying the load on the host. A duplicate of the data suitable for a demand of a user can be created by using a journal. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
In a remote mirroring system, device, and method, a master storage unit stores information in a log and uses the information from the log to quickly resynchronize slave images following a failure in the master storage unit. Upon receiving a write request from a host, the master storage unit stores a write entry in the log. The write entry includes information that identifies a portion of the slave images that may be unsynchronized from the master image due to the write request. The master storage unit then proceeds to update the master image and the slave images. The log is preserved through the failure, such that the.log is available to the master storage unit upon recovery from the failure. When the master storage unit is operational following the failure, the master storage unit resynchronizes the slave images to the master image by copying those portions of the master image indicated in the log to the slave images.