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1. US20120101973 - Storage system and its operation method

Office United States of America
Application Number 12992031
Application Date 26.10.2010
Publication Number 20120101973
Publication Date 26.04.2012
Grant Number 08521693
Grant Date 27.08.2013
Publication Kind B2
IPC
G06F 7/00
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
7Methods or arrangements for processing data by operating upon the order or content of the data handled
Applicants Ito Akira
Hitachi, Ltd.
Nakano Takahiro
Takaoka Nobumitsu
Akagawa Etsutaro
Inventors Ito Akira
Nakano Takahiro
Takaoka Nobumitsu
Akagawa Etsutaro
Agents Foley & Lardner LLP
Title
(EN) Storage system and its operation method
Abstract
(EN)

Predicting whether a file migration will be executed successfully or not.

A file storage apparatus in a high-order tier generates a migration task list that records scheduled time periods of migration execution and a total file size of files which are targets to be migrated, and transfers the generated migration task list to a file storage apparatus in a low-order tier; and the file storage apparatus in the low-order tier generates, based on the migration task list, a migration overlap table that records, for each unit time, whether the execution of a migration is scheduled or not, and a remaining file size table that records a predicted value of a data transfer amount for each unit time and a predicted value of a remaining file size for each unit time; and if the predicted value in the last scheduled time period, from among the predicted value of the remaining file size for each unit time which is recorded in the remaining file size table, is equal to or less than 0, it is predicted that the migration will be executed successfully; and if the predicted value in the last scheduled time period is more than 0, it is predicted that the execution of the migration will fail.

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