Storage Router and Method for Providing Virtual Local Storage

• US 20110035527A1
• Filed: 10/22/2010
• Published: 02/10/2011
• Est. Priority Date: 12/31/1997
• Status: Active Grant

• Current Assignee: Crossroads Systems (Texas) Incorporated (Crossroads Systems, Inc.)
• Original Assignee: Crossroads Systems (Texas) Incorporated (Crossroads Systems, Inc.)
• Inventors: Russell, Jeffry T., Hoese, Geoffrey B.
• Granted Patent: US 8,028,117 B2
• Time in Patent Office: Days
• US Class Current: 710/315
• CPC Class Codes: G06F 13/1668 Details of memory controller
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices
• CPC Class Codes: G06F 13/4022 using switching circuits, e.g. switching matrix, connection or expansion network G06F13/4009 takes precedence
• CPC Class Codes: G06F 13/4059 where the synchronisation uses buffers, e.g. for speed matching between buses
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/0607 by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
• CPC Class Codes: G06F 3/0661 Format or protocol conversion arrangements
• CPC Class Codes: G06F 3/0664 at device level, e.g. emulation of a storage device or system
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: G06F 3/0673 Single storage device
• CPC Class Codes: H04L 2101/631 Small computer system interface [SCSI] addresses
• CPC Class Codes: H04L 2101/645 Fibre channel identifiers
• CPC Class Codes: H04L 61/106 across networks, e.g. mapping telephone numbers to data network addresses
• 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]
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching

Abstract

A data storage gateway and method for providing virtual local storage on remote storage devices to devices. A plurality of devices, such as workstations, are connected to a first transport medium, and a plurality of storage devices are connected to a second transport medium. The storage router maps the virtual storage to one or more storage devices connected to the second transport medium such that the one or more storage devices contain at least a portion of the virtual storage and wherein the storage router allows access from the devices connected to the first transport medium to the virtual storage using native low level block protocol.

Claims

1. A data storage gateway for providing virtual local storage and capable of interfacing with and providing connectivity and mapping between devices connected to a first transport medium and storage devices connected to a second transport medium, the data storage gateway comprising:

a virtual storage;

a storage router in communication with and providing mapping to the virtual storage such that a device connected to the first transport medium remote from the storage devices can communicate data to and from the virtual storage; and

wherein the storage router maps the virtual storage to one or more storage devices connected to the second transport medium such that the one or more storage devices contain at least a portion of the virtual storage and wherein the storage router allows access from the devices connected to the first transport medium to the virtual storage using native low level block protocol.

2. The data storage gateway according to claim 1, further including a memory work space for the storage router using a buffer.

3. The data storage gateway according to claim 2 wherein the first transport medium connects to the storage router and interfaces with a first controller and wherein the second transport medium connects to the storage router and interfaces with a second controller.

4. The data storage gateway of claim 1, wherein the storage router provides centralized and transparent control of what storage space on the storage devices each device connected to the first transport medium sees as being its local storage.

5. The data storage gateway of claim 1, wherein the map is modifiable without involving the devices connected to the first transport medium.

6. The data storage gateway of claim 1, wherein the storage router is operable to present to each device connected to the first transport medium only the virtual storage mapped to it.

7. The data storage gateway of claim 1, wherein the storage router is operable to:

present a LUN to a first device connected to the first transport medium and a second device connected to the second transport medium;

map the presented LUN to a storage location so that requests for that LUN from the first device and the second device will be directed to the same storage location.

8. The data storage gateway of claim 1, wherein the storage router is operable to:

present a LUN to a first device connected to the first transport medium and a second device connected to the second transport medium;

map the presented LUN to multiple storage locations so that requests for that LUN from the first device and the second device will be directed to different storage locations.

9. The data storage gateway of claim 1, wherein the first and second transport medium use the same protocols.

10. The data storage gateway of claim 1, wherein the first and second transport medium use different protocols.

11. The data storage gateway of claim 10, wherein the data storage gateway is operable to communicate with a device connected to the first transport medium via Ethernet.

12. A method for providing, through a storage router, virtual local storage on remote storage devices to devices, comprising:

interfacing with a first transport medium;

interfacing with a second transport medium, wherein at least one of the first or second transport media is a serial transport medium;

maintaining a configuration for storage devices connected to the second transport medium that maps between the devices connected to the first transport medium and the storage devices connected to the second transport medium and that implements access controls for storage space on the storage devices; and

allowing access from initiator devices connected to the first transport medium to the storage devices connected to the second transport medium using native low level, block protocol in accordance with the configuration.

13. The method of claim 12, further comprising providing centralized and transparent control of what storage space on the storage devices each device connected to the first transport medium sees as being its local storage.

14. The method of claim 12, wherein the map is modifiable without involving the devices connected to the first transport medium.

15. The method of claim 12, further comprising presenting to each device connected to the first transport medium only the virtual storage mapped to it.

16. The method of claim 12, further comprising:

presenting a LUN to a first device connected to the first transport medium and a second device connected to the second transport medium;

mapping the presented LUN to a storage location so that requests for that LUN from the first device and the second device will be directed to the same storage location.

17. The method of claim 12, further comprising:

presenting a LUN to a first device connected to the first transport medium and a second device connected to the second transport medium;

mapping the presented LUN to multiple storage locations so that requests for that LUN from the first device and the second device will be directed to different storage locations.

18. The method of claim 12, wherein the first and second transport medium use the same protocols.

19. The method of claim 12, wherein the first and second transport medium use different protocols.