摘要:
A parallel sorting system is disclosed, having N (=2.sup.n) processing devices, each of which comprises a sort element storing unit, an inner sorting unit, a transposing unit, and a comparing and substituting unit. In the sort element storing unit, sort elements/N are stored. Sorting process is performed for n stages. In each stage, the inner sorting unit sorts the sort elements, and the transposing unit exchanges sorted elements at a transposing position with another processing device through a network. Thereafter, the comparing and substituting unit compares the two sets of sorts elements. This process sequence is repeated for all stages. And, after the transposing process and the inner sorting process are performed, the sorting process are completed. In this system, the number of communication times is reduced to 2n.
摘要:
A deadlock detection system each comprise a lock control table having entries corresponding to a resource when a plurality of resource requesters share a plurality of resources, a resource requester identifier list connected to a table of the lock control table, and a lock controller for managing an exclusive control by using the lock control table and the resource requester identifier list and for detecting a deadlock by examining a sequence inversion among resource requester identifiers on a list among competing resource requesters. An element of the resource requester identifier list can distinguish a shared lock from an exclusive lock by transferring a lock list obtained through a breakdown according to the content of a shared lock, and by independently examining the sequence inversion of resource requester identifier of the list among competing resource requesters.
摘要:
A database system including a transaction database system processing device for executing a transaction database process and a decision support database system processing device for executing a decision support process. The database system further includes a transaction database storage device, provided with the transaction database device, for retaining a transaction database created and updated by the transaction database process, a first and second database storage device, each provided with the decision support database device, and each for retaining a first and a second decision database, respectively, for use in a decision support process, a delayed updating device, provided with the decision support database device, for receiving a log created based on the transaction database at each of a predetermined time interval, and for alternatively supplying both the log received at a current predetermined time interval and the log received immediately preceding the current predetermined time interval to the first database storage device and to the second database storage device at each predetermined time interval, and a retrieving device, provided with decision support database device, for executing a retrieving process for the second decision database stored in the second database storage device when the delayed updating device supplies both logs to the first database storage device and for executing a retrieving process for the first decision database stored in the first database storage device when the delayed updating device supplies both logs to the second database storage device.
摘要:
In a cluster system: a heartbeat transmission unit in a service provision node transmits to a monitoring node a heartbeat packet which contains interval information indicating an interval greater than normal intervals at which normal heartbeat packets are transmitted, when an execution unit in the service provision node receives a stop command. Thereafter, when software realizing the execution unit is updated and the execution unit is restarted, the heartbeat transmission unit periodically transmits the normal heartbeat packets to the monitoring node at the normal intervals, where the normal heartbeat packets contain interval information indicating the normal intervals. A heartbeat monitoring unit in the monitoring node determines that the execution unit is in operation, while the monitoring node receives heartbeat packets at intervals indicated by the interval information stored in the monitoring node and updated with received interval information.
摘要:
A storage management apparatus manages a plurality of storage apparatuses connected to each other over a network in a storage system that distributes data among the storage apparatuses and stores the data therein. The storage management apparatus has a patrol process executing unit configured to execute a patrol process to confirm whether a storage area of each storage apparatus operates normally and a patrol flow controlling unit configured to control a patrol flow indicating the speed of the patrol process executed by the patrol process executing unit.
摘要:
A simultaneous failure occurrence degree calculation section calculates a simultaneous failure occurrence degree a value of which becomes smaller with an increase in a difference between numeric values indicative of manufacture date information on a computer which performs a process on the basis of a duplication combination management program. A combination pattern generation section then combines two of a plurality of storage apparatus and generates a plurality of combination patterns. A simultaneous failure occurrence degree adding section then calculates a total of simultaneous failure occurrence degrees corresponding to combinations of storage apparatus for each of the plurality of combination patterns. A duplication combination pattern determination section then determines that a combination pattern for which the total of simultaneous failure occurrence degrees is the smallest is a duplication combination pattern.
摘要:
A data allocation control program manages data allocation when data is distributively stored in a plurality of disk nodes that are shifted to a power saving mode unless access is performed for a certain time. The program produces a plurality of allocation pattern candidates each indicating the disk nodes in which the respective data are to be stored. The program calculates a no-access period expectation that represents an expected value of occurrence of a no-access period during which access is not performed to some of the disk nodes. The program selects as an allocation pattern for data reallocation, one of the plurality of produced allocation pattern candidates with the largest calculated no-access period expectation. The program instructs the disk nodes to reallocate the respective data in accordance with the selected allocation pattern.
摘要:
A storage management device includes a management unit for managing a storage device assigned thereto and a temporary storage unit assigned thereto. The management unit comprises a backup unit for, when data is written into the storage device, storing the data in the previously assigned temporary storage unit before the writing of the data into the storage device is completed, and a take-over unit for, when data which is already stored in the temporary storage unit, but which is not yet written into the storage device exists when the storage device and the temporary storage unit are assigned, writing the not-yet-written data into the storage device.
摘要:
A computer-readable recording medium having recorded a hash-value generation program for calculating a hash value within a shorter period of processing time. When a target disk is specified for hash value calculation, a segment division block divides the target disk into fixed-length segments. A first hash-value calculation block applies a one-way hash function to all data in each segment to calculate a per-segment hash value. A second hash-value calculation block arranges the per-segment hash values in a segment order corresponding to the order of the data stored on the target disk and applies the one-way hash function again to the arranged per-segment hash values to calculate a total hash value. The hash value calculated in this manner is defined as a hash value of the target disk.
摘要:
A computer-readable recording medium having recorded a hash-value generation program for calculating a hash value within a shorter period of processing time. When a target disk is specified for hash value calculation, a segment division block divides the target disk into fixed-length segments. A first hash-value calculation block applies a one-way hash function to all data in each segment to calculate a per-segment hash value. A second hash-value calculation block arranges the per-segment hash values in a segment order corresponding to the order of the data stored on the target disk and applies the one-way hash function again to the arranged per-segment hash values to calculate a total hash value. The hash value calculated in this manner is defined as a hash value of the target disk.