Hitachi, Ltd.

Tadashi Nota

Toshiyuki Kinoshita

Hitoshi Ueno

Shunji Tanaka

Masaichiro Yoshioka

Seiji Nagai

Yuki Kashiyama

A fault recovering method for substituting an instruction processor (IP) for a system supporting processor to execute processing thereof when the system supporting processor fails. An apparatus implementing this processing method comprises a plurality of processors, at least one of which is operated as a system supporting processor (SSP) and the rest of which are operated as instruction processors. When the SSP fails, an interrupt is generated to an OS running on at least one IP. The OS recognizes that a fault occurred in the IP, abnormally terminates an application program which has been running on the IP when the interrupt was generated, or stops instruction processing as the IP falling into a hardware failure state, or input a command for disconnecting an alternate instruction processor for the system supporting processor, so that the IP takes over functions of the SSP.

Processor fault recovering method for information processing system

In a fault recovery method for a multi-processor system including a main storage and a plurality of virtual machines which are assigned to a plurality of processors under control of a host operating system and a plurality of guest operating systems and which operate on the processors associated therewith, a fault occurring in one of the processors is detected to recover functions of the system. The method includes the steps of setting recovery attributes for failure to each of the virtual machines, assigning a plurality of virtual machines to a plurality of processors and operating the virtual machines on the processors respectively associated therewith, storing, at detection of occurrence of a fault in one of the processors, data and status information of virtual machines assigned to the processor and status information of the processor respectively in a virtual machine save area and a real machine save area of the main storage, storing fault information of the processor in the main storage by a fault recovery circuit having received a report of the fault, restarting an interrupted process and causing an interruption according to the status information of the virtual machines and the status information and fault information of the processor which are obtained from the main storage, and retrieving, when the interruption is received, one of the virtual machines assigned to the processor according to the processor status information in the real machine save area and then assigning the plural virtual machines to the plural processors for operation thereof according to the recovery attributes for failure set to the retrieved virtual machine.

Fault recovery method and apparatus

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Sagamihara, Japan

Tadashi Nota