Patent ID: 7136977
Filing Date: 2006-11-14
Classification: G06F,Y10S

Abstract:
1. A backup acquisition method for acquiring a whole or a differential backup from a disk array apparatus to a backup device, said method comprising; receiving a snapshot capture instruction from a server to said disk array apparatus having a first disk device storing data in a plurality of blocks and a plurality of pre-update data disk devices connected to said first disk device, said disk array apparatus being connected through a network to said server and said backup device; providing a plurality of snapshot management tables each having LBAs (logical block addresses) of said pre-update data disk devices and LBAs requested to update from said server and an index table having LBAs of said pre-update data disk devices and LBAs accessed from said server within a disk access controller of said disk array apparatus: capturing a snapshot of the contents of said first disk into said backup device under control of a controller of said disk array apparatus in response to said snapshot capture instruction to said disk array apparatus: sequentially recording updated data after the capture of said snapshot separately in said pre-update data disk devices of said disk array apparatus from the beginning thereof with recording an LBA for said undated data recorded in a snapshot management table for sequential recording; instructing said disk access controller of said disk array apparatus to acquire a whole backup of said undated data at an arbitrary timing; and sequentially reading all areas of said updated data recorded in said pre-update data disk devices by referring to said LBA recorded for said sequential recording to acquire the whole backup into said backup device.