Data migration method

• US 7,334,029 B2
• Filed: 11/04/2004
• Issued: 02/19/2008
• Est. Priority Date: 09/22/2004
• Status: Expired due to Fees

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Shiga, Kenta, Nakatsuka, Daiki
• Primary Examiner(s): Najjar; Saleh
• Assistant Examiner(s): KOROBOV, VITALI A
• Application Number:
  US10/980,196
• Publication Number:
  US 20060064466A1
• Time in Patent Office: 1,202 Days
• Field of Search: 709213- 6, 709/211, 709/217, 709/223, 709/226, 709/227, 709/245, 711/200
• US Class Current: 709/223
• CPC Class Codes: H04L 67/1095 Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

A system is provided in which a first storage device for managing a target to which a first physical port and a first logical volume are allocated, a second storage device for managing a second logical volume, and a computer for establishing a first communication path with the first physical port and conducting access to the target by using the communication path. The first storage device creates in the second storage devices a target holding an identifier identical to that of the aforementioned target and allocates the second logical volume and a second physical port to the target, and the computer establishes a second communication path with the second physical port and maintains the access to the target by using the second communication path.

Claims

1. A system comprising:

a first device;

a second device;

a third device; and

a network for mutually connecting said first, second, and third devices, wherein

said first device designates to said second device creation of a storage area having an identifier identical to an identifier assigned to a storage area that is owned by the first device itself and accessed by said third device,

said second device creates a storage area having said identifier based on the designation from said first device; and

said third device accesses the storage area owned by said second device by using said identifier;

wherein said first device and second device are storage devices, and said third device is a computer;

wherein each of said first and second devices has one or more ports, and said identifier is associated with the combination of one of said ports and said storage area;

wherein said third device

establishes a first communication path with a first port corresponding to said identifier of said first device;

establishes a second communication path with a second port corresponding to said identifier of said second device after the storage area having said identifier has been created in said second device; and

disconnects said first communication path based on the designation of said first device and then conducts communication with said second device by using said second communication path;

the system further comprising a name management device connected to said network, wherein

said second device sends to said name management device information of said second port together with information of said identifier after the creation of the storage area having said identifier;

said name management device notifies said third device that there are changes in information of the storage area corresponding to said identifier based on the information sent from said second device; and

said third device establishes said second communication path with said second port based on the notification from said name management device.

2. The system according to claim 1, wherein

said first device requests said name management device to delete information of association of said first port and said identifier after the storage area having said identifier has been created in said second device.

3. The system according to claim 2, wherein said first device, said second device, and said third device communicate by using the iSCSI protocol.

4. The system according to claim 3, wherein said name management device communicate with said first device, said second device, and said third device by using iSNSP.