Fujitsu Corporation

Tomoaki Mizoo

Toshirou Ono

Yasuki Yoshihashi

Ryo Matsumura

Kazuhiro Taniguchi

Shoichi Kogiso

Teruyuki Goto

Motoyuki Mashima

Hideyuki Furue

A redundant system includes a primary system including a first node and a second node, and a secondary system including a third node and a fourth node. When the secondary system in place of the primary system operates, the fourth node executes first takeover processing or second takeover processing, the first takeover processing taking over the primary system on the basis of data update information acquired from either a second inter-system transfer path or a second intra-system transfer path, and the second takeover processing taking over the primary system on the basis of both the data update information acquired from the second inter-system transfer path and the data update information acquired from the second intra-system transfer path.

Redundant system and redundancy method

When the redundant system operates the second node in place of the first node in the primary system and transmits, to the secondary system, data update information generated according to a data update in the second node, the fourth node the data update information generated according to the data update in the second node from the second node using the second inter-system transfer path. The fourth node changes by changing a direction of the second intra-system transfer, a configuration by which the data update information acquired by the fourth node is acquired by the third node using the second inter-system transfer path.

Redundant system, method for redundant system, method for controlling node of redundant system and computer readable storage medium

A primary system includes a first node and a second node that backs up the first node. A secondary system includes a third node and a fourth node that backs up the third node. The first node transmits data update information generated in response to a data update in the first node, to the second node and the third node. The fourth node determines a degree of progress in transactions indicated by data update information obtained through the second node and a degree of progress in transactions indicated by data update information obtained through the third node, identifies data update information indicating a further progressed transaction, and reflects the data update information in stored data of the fourth node.

Redundant system, redundancy method, and computer-readable recording medium

A primary system includes a first node and a second node that backs up the first node. A secondary system includes a third node and a fourth node that backs up the third node. The first node in the primary system inserts, when transmitting data update information generated in response to a data update in the first node to the second node and the third node, one or a plurality of pieces of delimiter information indicating a boundary between update processing units, into both of transmit data. The fourth node in the secondary system specifies, based on the delimiter information, the data update information including update information whose process has progressed further from among the data update information obtained from the second node and the data update information obtained through the third node, and reflects the specified data update information to stored data of the fourth node.

A database control method comprising a first main system processing in which, upon first data being stored in a second storage unit included in a second server communicably connected with the first server, the first data is stored in a first storage unit following instructions from a host computer, a first inhibiting processing in which, upon detecting an abnormality in communication with the second server, storing the first data in the first storage unit following instructions from a host computer is inhibited, a first query processing performing a first query to an arbitrating device arbitrating between the first server and the second server, and a processing executing or stopping the first main system processing in accordance with instructions from the arbitrating device.

Database system and database control method

A transference control apparatus includes a communication controller, and a processor that executes a procedure, the procedure including processing a control that causes first processing, in which an update log representing the update content of updating performed for a first database is transmitted, by the communication controller, to a second database serving as a copy destination for the first database, to be performed with priority over second processing, in which transmission target data contained in the first database is transmitted to the second database, and restraining, in the case that updating of the transmission target data is allowed in the first database, the control that causes the first processing to be performed with priority.

Transference control method, transference control apparatus and recording medium of transference control program

An active device attaches a sequential number representing a notification number to update record information for recording an event that data is stored, then notifies a preliminary device of the update record information, and, accumulates the update record information. The active device again makes the notification. The preliminary device monitors the update record information of which the active device notifies and detects, based on regularity of the sequential numbers attached to the respective pieces of update record information, missing reception of the update record information. When detecting the missing reception of the update record information, the preliminary device makes a request for retransmitting the update record information and notifies of information about matching data stored in a first storage unit of the active device with data stored in a second storage unit of the preliminary device.

Growing community of inventors

Kobe, Japan

Tomoaki Mizoo