International Business Machines Corporation

Fumitomo Ohsawa

Ichiroh Koyanagi

Makoto Ohtuki

Takayuki Satoh

Hideaki Komatsu

Nobuaki Takahashi

Masaki Kataoka

Masakuni Okada

Shingo Nagai

Yoshiko Ishii

Goh Kondoh

Naoki Matsuo

In a parallel computing system having a plurality of computing node groups including at least one spare computing node group, a plurality of managing nodes for allocating jobs to the computing node groups and an information management server having respective computing node group status information are associated with the computing node groups, and the respective managing nodes update respective in-use computing node group status information by accessing the information management server. Furthermore, when the managing node detects an occurrence of a failure, the managing node having used then the computing node group disabled due to the failure identifies a spare computing node group by accessing the computing node group status information in the information management server. Then, the managing node having used then the disabled computing node group obtains the computing node group information of the identified spare computing node group. Furthermore, since the managing node having used then the disabled computing node group can continue processing by switching the disabled computing node group to the identified spare computing node group as a computing node group to be used, on the basis of the computing node group information of the identified spare computing node group, the redundancy in the parallel computing system can be secured.

Method, system and program for securing redundancy in parallel computing system

A simulation system having multiple peripherals that communicate with each other. The system includes a weighted graph with weights set as communication times. The peripherals are represented as nodes and connection paths are represented as edges. Among the communication times in the loop, the minimum time is set as first synchronization timing. Timing with an acceptable delay added is set as second synchronization timing. Timing set by a user to be longer than the first and second timings is set as third synchronization timing. The third synchronization timing is used in a portion where the timing is usable, thus synchronizing the peripherals at the longest possible synchronization timing.

Simulation method, system and program

There is provided a system including a cluster, a clusterand an image server. A hostconstituting the clusterhas a root file systemused to operate the hostin a local disk. The image serverhas a root file systemused to operate the host, and the hostvirtually constructs a root file systemby mounting the root file system. When the root file systemis varied, the hostsynchronizes the root file systemwith the root file system. The same applies to hostconstituting the cluster

System and method for managing root file system

A fixed disk storage unit is mounted in a protective outer case and is supported by elastic shock absorbers. A head/disk enclosure including a rotatable disk and a head actuator of the fixed disk storage unit therein, and an electronic card on which electronic circuits are mounted, are placed abreast with a gap there between on substantially the same plane in the protective outer case, and the head/disk enclosure is supported on all sides including the side next to the gap by the shock absorbers. This construction provides a shockproof and portable disk storage apparatus which is small-sized and whose manufacturing process is simple.

Shockproof and portable disk storage apparatus having shock absorbers on

A fixed disk storage unit is mounted in a protective outer case, and is supported at one end by a flexible cable which connects a connector of the protective outer case with the fixed disk storage unit in the protective outer case, and supported at the other end by using elastic shock absorbers against the elasticity of the flexible cable. A head/disk enclosure including a rotatable disk and a head actuator of the fixed disk storage unit therein, and an electronic card on which electronic circuits are mounted, are placed abreast on substantially the same plane in the protective outer case, and the head/disk enclosure is supported by the shock absorbers. This construction provides a shockproof and portable disk storage apparatus which is small-sized and whose manufacturing process is simple.

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Kanagawa-ken, Japan

Fumitomo Ohsawa