Abstract:
PROBLEM TO BE SOLVED: To perform access not lowering a performance specialized in sequential media without executing mounting depending on a hardware device on an application side.SOLUTION: In a file system 60, a command processing part 61 takes out an option indicating a file listing method from a command, an index reception part 63 receives an index including a directory name, a file name and a recording position from a tape drive, and an index storage part 66 stores the index in the state as it is or in the state of changing the directory name or the file name according to the listing method indicated by the option. In the meantime, when an IRP reception part 67 receives an IRP (I/O Request Packet) from an OS, an IRP setting part 68 stores the file name inside the index in a buffer of the IRP in the order of the recording position, and a response transmission part 69 returns a status to the OS.
Abstract:
The invention provides a method that detects whether data on a tape drive used in a file system has been altered. The method contains: (a) a step that prepares a first tape cartridge provided with a tape in which multiple files and an index information history have been stored in a WORM partition, and index information has been stored in an R/W partition; (b) a step that reads and compares the R/W partition index information and the index information at the end of the WORM partition; and (c) a step that determines that the R/W partition index information has been altered if the R/W partition index information does not match the index information at the end of the WORM partition.
Abstract:
Die vorliegende Erfindung stellt ein Verfahren zum Erkennen bereit, ob Daten in einem Bandlaufwerk manipuliert worden sind, das in einem Dateisystem verwendet wird. Das Verfahren beinhaltet die Schritte: (a) Bereitlegen einer ersten Bandkassette, die ein Band enthält, auf dem in einer WORM-Partition mehrere Dateien und Archiv-Datensätze von Indexinformationen und in der R/W-Partition eine Indexinformation gespeichert sind; (b) Lesen und Vergleichen der Indexinformation der R/W-Partition und der neuesten Indexinformation der WORM-Partition miteinander; und (c) Feststellen, dass die Indexinformation der R/W-Partition manipuliert worden ist, wenn diese beiden einzelnen Indexinformationen nicht übereinstimmen.
Abstract:
PROBLEM TO BE SOLVED: To achieve the use efficiency of a plurality of storages as a whole in the case of storing data in those storages.SOLUTION: In a storage node 20, a meta data extraction part 21 is configured to extract meta data from storage object data from a client 10, and a node determination part 24 is configured to, on the basis of the capacity information of each storage node stored in a capacity information storage part 22 and summary data obtained by integrating the meta data of the storage data of each storage node stored in a summary data storage part 23, determine a storage node in which the storage object data should be stored, and a data transfer part 25 is configured to, when the determined storage node is a self-node, store the storage object data in a data storage part 27, and a summary data registration part 26 is configured to register the extracted meta data in the summary data of the self-node, and the data transfer part 25 is configured to, when the determined storage node is another node, transfer the storage object data to the node.