Abstract: 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.

Abstract: In the present invention, when there is a change in a group of volumes managed by a host computer, data duplication processing is immediately carried out against the changed volume. The host computer 10 comprises a volume-managing portion(unit) 12, a data duplication-controlling portion(unit) 11 which executes the data duplication of the data stored in the volume 32 in the main data center 3, and a data duplication storing portion(unit) 13 which stores data necessary for the data duplication. The data duplication-controlling portion 11 compares data held by the volume-managing portion 12 and the data in the data duplication storing portion 13, and updates the data in the data duplication storing portion 13 based on the data held by the volume-managing portion 12.

Abstract: When collecting information about management of a storage of a disk subsystem, loads imposed on a host computer and a network are alleviated to improve the throughput of a computer system having the storage. The disk subsystem includes a CPU and a main memory and information on a disk is collected in response to a request from a management computer. An information collection program is operated on the disk subsystem, whereby, volume management information can be edited on the disk subsystem and utilized by the management computer.

Abstract: 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.

Abstract: 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.

Abstract: To prepare for re-initiation of a computer system, a content of a main memory after system initiation is saved in a save area of a main memory, The content of the save area is restored to the main memory when re-initiation.