Hitachi, Ltd.

Masaya Ichikawa

Hirofumi Nagasuka

Masahiro Kiyoi

Yuri Hiraiwa

Hideki Masuda

Atsushi Tanaka

Katsuhisa Miyata

Kenichi Oyamada

Yuzuru Maya

Masaru Satou

Akira Otsuji

Shuuzou Takeo

Hideaki Sampei

Consistency of a shared disk is secured in system switching in a hot standby system. In the standby system in which an active computer and standby computer share the shared disk, when a write I/O request is issued from the active computer, information about a start of the I/O is recorded in, for example, a memory. When the I/O is completed, the information is deleted from the memory. When a failure occurs in the active computer, the active computer transmits the record of the information about the start of the I/O, to the standby computer. The standby computer verifies the record to recover a disk in which the I/O is to be executed.

Hot standby system

A storage system is disclosed comprising a management computer and multiple storage subsystems with multiple volumes accessible to a host computer. The host computer sends volume configuration information to the management computer. Each storage subsystem retrieves information from the volume directory corresponding to a requested volume and sends it to the management computer. The management computer comprises a volume information table holding the volume configuration information obtained from the host computer, information on storage subsystems, and use-related ID group IDs; a unit which identifies the volumes belonging to a specified group ID, locates the storage subsystems these volumes belong to, and obtains information on the desired volumes from their corresponding volume directories; and a display device which displays information on the usage of the volumes that is obtained from storage subsystems. Thus, volume information in multiple storage subsystems can be collected in an integrated manner, thereby reducing management overhead.

Storage management method and system

According to the present invention, as regards a computer system that uses virtual storage management, because content of auxiliary storage utilized by paging is used, dump information can be obtained by outputting only a part of the content of the auxiliary storage at the time of occurrence of an abnormal system condition. As a result, time required to restart the computer system and business can be shortened. What is more, because it is not necessary to add a special external storage for obtaining dump information, computer resources can be utilized more efficiently.

Method and apparatus for getting dump of a computer system

Dump information acquiring and system recovery methods for a computer system using a virtual memory. The computer system has a plurality of external storage units normally used as a paging device unit for holding the contents of the virtual memory to be paged out. When fault occurs, a program for acquiring dump information outputs the contents of the main storage to a dump file. The identifier of the external storage unit set to definition information defining the external storage unit is changed from the identifier of the external storage unit to the identifier of another external storage unit. Thereafter, the computer system is restarted. The contents of the virtual memory held in the paging device unit at the time of fault output to the dump file.

Computer system and methods for acquiring dump information and system recovery

A dump information acquiring method and a system recovery method for a computer system using a virtual memory, the methods being used when fault occurs in the computer system. The computer system has a plurality of external storage units used as a paging device unit for holding the contents of the virtual memory to be paged out from a main memory. During the normal operation, an external storage unit selected from the plurality of external storage units is used as the paging device unit. When fault occurs, a program for acquiring dump information operates to output the contents of the main storage at the time of the fault occurrence to a dump file. The identifier of the external storage unit set to definition information for defining the external storage unit used as the paging device unit is changed from the identifier of the external storage unit used as the page device unit to the identifier of another external storage unit. Thereafter, the computer system is restarted. The contents of the virtual memory held in the paging device unit at the time of the fault occurrence are output to the dump file by a program executed in a background of a job process of the current computer system or by a program executed by another computer system.

Growing community of inventors

Sagamihara, Japan

Masaya Ichikawa