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Storage system and method of storage system path control

a storage system and path control technology, applied in the field of storage system and a method of storage system path control, can solve the problems of ineffective use waste of old type of storage device, and achieve the effect of improving ease of use and reliability, and effective use of storage resources

Inactive Publication Date: 2006-06-29
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a storage system and method for controlling the path of a storage device to link multiple storage devices together. The system includes a first storage device with a virtual volume used by the host, a second storage device with an actual volume associated with the virtual volume, and a mapping management section connecting the virtual volume and actual volume. The control section selects among the multiple communications paths for processing access requests from the host. The system can connect multiple storage devices via a plurality of communications paths, and the control section can switch between the paths based on priority and failure detection. The system improves efficiency in maintenance work and allows for recovery from failures while processing access requests from the host.

Problems solved by technology

However, when data has been completely transferred, the old type of storage device is wasted, and the old type of storage device cannot be used effectively.

Method used

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  • Storage system and method of storage system path control
  • Storage system and method of storage system path control
  • Storage system and method of storage system path control

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

1. First Embodiment

[0077]FIG. 2 is a block diagram showing the configuration of the primary components of the storage system. As described below, this storage system can be, for example, configured to include a host 10, a management terminal 20, a management center 30, a plurality of storage devices 100 and 200, and a switch 300 connecting storage devices 100 and 200.

[0078] The host 10 and first storage device 100 are connected via the communications network CN1. The first storage device 100 and the second storage device 200 are connected via a plurality of communications networks CN2.

[0079] The first storage device 100 and the management terminal 20 are connected via the communications network CN3. Furthermore, the first storage device 100 and the management center 30 are connected via the communications network CN4.

[0080] The host 10 is a computer device comprising information processing resources such as a CPU (Central Processing Unit) and a memory and the like, and is configu...

second embodiment

2. Second Embodiment

[0183] The second embodiment is described based on FIG. 13 through FIG. 15. The following embodiments, including the present embodiment, are equivalent to variations of the first embodiment. In the present embodiment, the first storage device 100 and the second storage device 200 are connected by a plurality of paths, and access requests from the host 10 are processed while these paths are selected in sequence.

[0184]FIG. 13 shows an example of the WWN information management table T3. The WWN information management table T3 is information for the management of the alternate path mode (use mode) of the second storage device 200 being external storage.

[0185] The alternate path mode, can be, for example, the single path mode, or the multi-path mode. The single path mode is a mode wherein one of a plurality of paths is selected for use as described in the first embodiment. The multi-path mode is a mode wherein a plurality of paths are selected in sequence for use as...

third embodiment

3. Third Embodiment

[0194] The third embodiment is described based on FIG. 16 through FIG. 19. In this embodiment, path operation is possible in prescribed units.

[0195]FIG. 16 a flowchart showing an outline of path operation processing. This processing can be executed with the storage management section 22 of the management terminal 20. Firstly, the user calls up the path configuration processing screen (S110), and selects from the menu (S111).

[0196] The operation menu can be, for example, a menu for manipulating path configuration in units of external ports, a menu for manipulating path configuration in units of external storage ports, or a menu for manipulating path configuration in units of external volumes 240.

[0197] When the user desires to process in units of external ports, the user selects the external port to be manipulated (S112). The management terminal 20 displays the configuration of all paths connected to the external port in a list format (S113). The user selects al...

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PUM

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Abstract

The present invention uses memory resources effectively and connects each storage device by a plurality of paths in a switchable manner, thus improving reliability and ease of use, by virtualizing external memory resources as internal memory resources. External storage 2 is connected to the main storage 1, and the actual volume 2A is mapped onto the virtual volume 1A. A plurality of paths is connected between the storage 1 and 2. When a failure occurs in a path in use (S3), the path having the next highest priority is selected (S4), and processing is continued using this path (S5).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application relates to and claims priority from Japanese Patent Application No. 2004-372713 filed on Dec. 24, 2004, the entire disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] The present invention relates to a storage system and a method of storage system path control. [0003] For example, in order to handle large volumes of various types of data in government, public offices, local authorities, industry, and educational institutions and the like, comparatively large-scale storage systems are used in management of data. These storage systems are, for example, comprised of disk array devices and the like. Since a disk array device is comprised of a plurality of storage devices arranged in an array, for example, a storage area based on a RAID (Redundant Array of Independent Disks) is provided. [0004] At least one logical volume (logical unit) is formed in the physical storage area provided b...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F3/06
CPCG06F3/0614G06F3/0635G06F3/067G06F11/2005G06F11/201
Inventor YAGI, SHUICHITANINAKA, DAIMASHIMA, TAKAO
Owner HITACHI LTD
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