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1. IN4125/DELNP/2013 - COMPUTER SYSTEM

Office India
Application Number 4125/DELNP/2013
Application Date 08.05.2013
Publication Number 4125/DELNP/2013
Publication Date 21.11.2014
Publication Kind A
IPC
G06F 11/20
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
11Error detection; Error correction; Monitoring
07Responding to the occurrence of a fault, e.g. fault tolerance
16Error detection or correction of the data by redundancy in hardware
20using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
G06F 9/46
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
9Arrangements for program control, e.g. control units
06using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
46Multiprogramming arrangements
Applicants HITACHI LTD.
Inventors KIM Sungho
NISHIJIMA Eiji
Title
(EN) COMPUTER SYSTEM
Abstract
(EN)
In order for a plurality of virtual machines installed on a physical computer to operate in the same operation mode the present invention switches a main system and a subsystem of each virtual machine. A computer system has a plurality of computer nodes and each computer node has a plurality of virtual computers and a control base unit controlling the virtual computers. Each virtual computer constitutes a multiplexing group with another virtual computer operating on another computer node different from its own computer node with either one operating as the main system and the other operating as the subsystem. The control base unit controls whether each virtual computer is operating as either the main system or the subsystem and monitors the respective states of each virtual computer. The control base unit when it has detected in its own node a failure of the virtual computer operating as the main system virtual computer determines in accordance with predetermined rules whether to also switch the other virtual computers operating on its own computer node from main system virtual computers to subsystem virtual computers along with the virtual computer in which the failure occurred.

Also published as
GB1308167.4