Disk array device and virtual volume management method using a logical table and a physical table

A logical table has a layered structure formed of a higher layer logical table arranged on a memory and a lower layer logical table arranged on a disk and stores where each part of a physical region corresponding to each part of a virtual volume is located, a physical table has a layered structure f...

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Bibliographic Details
Main Author KUWATA ATSUSHI
Format Patent
LanguageEnglish
Published 07.10.2008
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:A logical table has a layered structure formed of a higher layer logical table arranged on a memory and a lower layer logical table arranged on a disk and stores where each part of a physical region corresponding to each part of a virtual volume is located, a physical table has a layered structure formed of a higher layer physical table arranged on the memory and a lower layer physical table arranged on the disk and stores a state of assignment of each part of a physical region, and a controller copies a part or all of the lower layer logical table and the lower layer physical table into the memory to conduct management of virtual volume.
Bibliography:Application Number: US20030635529