Hitachi, Ltd.

Hirofumi Nagasuka

Katsuhisa Miyata

Masaya Ichikawa

Masahiro Kiyoi

Kazuhiko Watanabe

Kenta Ninose

Yuri Hiraiwa

Taketoshi Sakuraba

Tuneo Iida

Toshiaki Arai

Tadashi Yamagishi

Masaru Satou

Akira Otsuji

Hideki Masuda

Atsushi Tanaka

Kazuyoshi Serizawa

Masahiro Mimura

Toshiyuki Kinoshita

Kenichi Oyamada

Shunji Tanaka

Yoshiaki Shinmura

Yuri Hondou

Nobuyuki Osaki

Yumiko Sugita

Yoshiyuki Iwakura

Yuzuru Maya

Masahiro Yamashita

Katsuhisa Ogasawara

Shuuzou Takeo

Keiko Kiyoi, Legal Representative

Tooru Okuda

Hideki Ishiai

Hiroaki Muratani

Shuichi Tanaka

A technique for identifying a fundamental cause of a system fault in a system in which a plurality of OSs run on one computer. In a system in which each of a plurality of operating systems executes a process by time-sharing hardware of one computer, a plurality of related OSs are stored in advance in association with each other, in a storage means. When a fault is detected in an OS and the storage means stores an OS associated with the OS in which the fault has occurred, a memory dump is performed for the OS in which the fault has occurred and the OS associated with that OS.

Memory dump method, memory dump program and computer system

A computer system includes a host computer, a disk control device controlling operation of a storage sub-system, and a management server managing configuration of the storage sub-system. The host computer registers the result of grouping of a plurality or volumes in the storage sub-system according to a use purpose in a volume management table including a volume identifier, a physical address, and a group identifier allocated in the disk control unit. During access to the volume via the host, the disk control unit obtains the physical address belonging to a storage belonging to a group identical to the group input via the host, notifies information described on the volume list of the storage allocated at the physical address to the management server, and causes the server to display the information.

Storage management method

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

In the data transfer method between a couple of computer nodes in the related art, an overhead for the waiting between programs to conduct the data transfer is considerably large. In the present invention, a first program to transmit data stores the data to the main storage area in the desired time interval. A second program to receive data refers to the above area using RDMA in the desired time interval. Otherwise, the second program to receive data refers to the main storage in the desired time interval. A first program to transmit data stores data to above area using RDMA in the desired time interval. Moreover, in order to detect the passing between the write and read operations, an identifier is provided to each record and the access sequence of the identifier and record is inverted in the read and write operations. Or, an identifier and an error checking code are added to each record.

Computer system and a data transfer method thereof using remote direct memory access

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.

Disk subsystem, computer system, storage managing method and program

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

In a computer system with a plurality of levels of cache storage, a cache control method prevents data duplication among the levels of cache storage to increase cache storage utilization. A high-level cache staging unit stages reads data from a disk unit, stages the data to a high-level cache, and instructs to destage the data, which has been read, from a low-level cache. A high-level cache destaging unit writes data to be destaged to the disk unit, instructs to stage the data, which has been written, to the low-level cache, and destages the data from the high-level cache. A low-level cache staging unit stages a data, which is written by the high-level cache destaging unit, to the low-level cache. A low-level cache destaging unit destages a data, which is instructed by the high-level cache staging unit, from the low-level cache.

Control method of the cache hierarchy

A job scheduling analysis method and system are disclosed in which a job schedule is analyzed by use of historical job execution data in a computer system in which a plurality of jobs are executed in parallel. Historical execution data of a plurality of jobs and the file names of files accessed by the jobs are collected. The maximum multiplicity of jobs capable of operating in parallel on the computer system is inputted. When the file name of a file accessed by one job and the file name of a file accessed by another other job coincide with each other, an execution start condition of the plurality of jobs are determined to execute the one job and the other job at the earliest instants within the maximum job multiplicity so that the sequence of execution of processings by the one job and the other job is maintained and the execution time of the one job and the execution time of said other job do not overlap each other. Thereby, it is possible to simulate the influence of a change in system construction and to search for an effective batch processing with a reduced number of idle spaces.

Job scheduling analysis method and system using historical job execution data

A computer system and a parallel execution control method thereof. A job execution managing module includes a job control statement interpreting module for deciding by interpretation of job control statements whether jobs registered by a job registration processing module are capable of undergoing parallel execution. For the jobs susceptible to the parallel execution, the job execution managing module commands reregistration of such job to the job registration processing module. The job control statement interpreting module further decides by interpreting the control statement whether execution of individual job steps of registered jobs are to be skipped or not. The job step decided to be skipped is inhibited from execution by a step execution control module. Time taken for execution of jobs and job steps can be shortened.

Method and system for controlling parallel execution of jobs

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.

A computer system supports the application of a function supplied by OS or utility program. A generating section generates system operation information including job execution history information and file access history information. In accordance with the system operation information, a determining section determines a job or job step to which the function can be applied. In response to a notice from the determining section, a converting section converts an original job control program or job into new job control programs or jobs, and outputs the new job control programs or jobs.

Computer system for supporting utilization of functions provided by OS

An enqueue structure type is provided within a coupling facility to record the use state and to manage a request queue of resources shared among programs on computers of a system. All programs to use a shared resource issue a request to reserve the shared resource to the coupling facility before using it. The coupling facility affords the permission to use the resource to the programs if it is usable, and adds the programs to the resource request queue if unusable. When a program using the shared resource frees it, the coupling facility fetches a program from the beginning of the request queue, reserves the shared resource for the next program and notifies the next program that the use of the shared resource has been approved. On receiving the notification, the program uses the shared resource without asking the coupling facility for the approval of the use of the shared resource again. Further, exclusive control of shared resources by use of a spin lock having shared and exclusive attributes is implemented by using two locks for one shared resource, wherein the first lock is reserved and then freed after the second lock is reserved.

Growing community of inventors

Sagamihara, Japan

Hirofumi Nagasuka