Root node for file level virtualization

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EP 1 973 049 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	Note: Bibliography reflects the latest situation

(15)	Correction information:
	Corrected version no 1 (W1 A2)

(48)	Corrigendum issued on:
	10.12.2008 Bulletin 2008/50

(43)	Date of publication:
	24.09.2008 Bulletin 2008/39

(21)	Application number: 08250166.9

(22)	Date of filing: 14.01.2008

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International Patent Classification (IPC):

G06F 17/30^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA MK RS

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Priority:

23.03.2007 JP 2007076867

(71)	Applicant: Hitachi, Ltd.
	Tokyo 100-8280 (JP)

(72)	Inventors:
	Nakamura, Takaki Tokyo 100-8220 (JP) Sonoda, Koji Tokyo 100-8220 (JP) Nemoto, Jun Tokyo 100-8220 (JP)

(74)	Representative: Hodsdon, Stephen James et al
	Mewburn Ellis LLP York House 23 Kingsway London WC2B 6HP London WC2B 6HP (GB)

(54)	Root node for file level virtualization

(57) A root node creates and issues an object ID comprising share information designating a share unit, which is a logical public unit. The share unit is a logical public unit comprising no less than two objects. Transfer control information in which share information is associated with device information showing a device for managing this share unit, is prepared for each share unit. The root node receives request data, which has an object ID comprising share information, specifies device information corresponding to the share information in this object ID from the transfer control information, and transfers the request data to the device indicated in this device information.