Storage router and method for providing virtual local storage

• US 8,046,515 B2
• Filed: 10/31/2007
• Issued: 10/25/2011
• Est. Priority Date: 12/31/1997
• Status: Expired due to Fees

• Current Assignee: Crossroads Systems (Texas) Incorporated (Crossroads Systems, Inc.)
• Original Assignee: Crossroads Systems (Texas) Incorporated (Crossroads Systems, Inc.)
• Inventors: Hoese, Geoffrey B., Russell, Jeffry T.
• Primary Examiner(s): Shin, Christopher B
• Application Number:
  US11/980,909
• Publication Number:
  US 20080065808A1
• Time in Patent Office: 1,455 Days
• Field of Search: 710 1- 5, 710 8- 13, 710 36- 38, 710126-131, 710/250, 710/305, 709/258, 714/42, 711110-113
• US Class Current: 710/305
• 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 storage router (56) and storage network (50) provide virtual local storage on remote SCSI storage devices (60, 62, 64) to Fiber Channel devices. A plurality of Fiber Channel devices, such as workstations (58), are connected to a Fiber Channel transport medium (52), and a plurality of SCSI storage devices (60, 62, 64) are connected to a SCSI bus transport medium (54) The storage router (56) interfaces between the Fiber Channel transport medium (52) and the SCSI bus transport medium (54). The storage router (56) maps between the workstations (58) and the SCSI storage devices (60, 62, 64) and implements access controls for storage space on the SCSI storage devices (60, 62, 64). The storage router (56) then allows access from the workstations (58) to the SCSI storage devices (60, 62, 64) using native low level, block protocol in accordance with the mapping and the access controls.

Claims

1. A method for configuring virtual local storage comprising:

configuring a map at a management station that maps between host devices and remote storage devices remote from the host devices, wherein the map is configured for a routing device that implements access controls for storage space on the remote storage devices in accordance with the map and allows access from host devices connected to a serial transport medium to the remote storage devices connected to the second transport medium through using low level, block protocols; and

communicating the map from the management station to the routing device.

2. The method of claim 1, wherein the map allocates subsets of storage space to associated hosts devices.

3. The method of claim 1, wherein the map maps from a host identification to a virtual address for at least a portion of an associated remote storage device.

4. The method of claim 1, wherein the map maps from a host identification to a physical address for at least a portion of an associated remote storage device.

5. The method of claim 1, wherein the management station connects to the routing device via an Ethernet connection.

6. The method of claim 1, wherein the serial transport medium is an Ethernet transport medium, wherein the host device is operable to communicate using the iSCSI protocol, and wherein the first controller receives an iSCSI communication from the host device, the iSCSI communication comprising a SCSI command, and the routing device forwards the SCSI command to the one or more remote storage devices or portions thereof for which the host device is allowed access.

7. The method of claim 1, further comprising receiving error information at the management station from the routing device.

8. A method of configuring virtual local storage comprising:

connecting a management station to a routing device;

establishing a set of configuration information that associates a host device connected to a serial transport medium and at least a portion of a remote storage device connected to a second transport medium for controlling access to the at least a portion of the remote storage device;

sending the configuration information from the management station to a routing device; and

storing the configuration information in a memory at the routing device, wherein the routing device is configured to receive a low level block protocol request from the host device to the remote storage device and control access between the host device and the remote storage device in accordance with the configuration information and forward the low level block protocol request to the at least a portion of the remote storage device if the host device is determined to be allowed access to the at least a portion of the remote storage device according to the configuration information.

9. The method of claim 8, wherein the configuration information comprises one or more tables that map an identification for the host device to a physical address for the at least a portion of the remote storage device.

10. The method of claim 8, wherein the serial transport medium is an Ethernet transport medium, wherein the low level block protocol is SCSI, wherein the SCSI low level bock protocol is encapsulated in an iSCSI transport protocol, and the routing device forwards allowed SCSI request to the remote storage device.

11. The method of claim 8, wherein the management station connects to the routing device via an Ethernet connection.

12. The method of claim 8, further comprising receiving error information at the management station from the routing device.

17. The system of claim 11, wherein the map allocates subsets of storage space to associated hosts devices.

18. The system of claim 11, wherein the map maps from a host identification to a virtual address for at least a portion of an associated remote storage device.

19. The system of claim 11, wherein the map maps from a host identification to a physical address for at least a portion of an associated remote storage device.

13. A system for providing virtual local storage on remote storage devices to host devices connected to a serial transport medium comprising:

a management station, the management station operable to allow a user to define a map for a routing device that controls access from host devices connected to a serial transport medium to remote storage devices connected to a second transport medium and allows access from host devices connected to the serial transport medium to the remote storage devices connected to the second transport medium through using low level, block protocols;

a routing device coupled to the management station via a management transport medium, the routing device operable to;

receive the map from the management station and store the map in a memory;

implement access controls for storage space on the remote storage devices in accordance with the map; and

allow access from host devices to the remote storage devices through using native low level block protocols.

14. The system of claim 13, wherein the management transport medium is one of the first or second transport media.

15. The system of claim 13, wherein the management station is further configured to configure the routing device to maintain an allocation of subsets of remote storage space to associated hosts device connected to the serial transport medium so that each subset is only accessible by the associate host device.

16. The system of claim 14, wherein the management transport medium is an Ethernet transport medium.

20. A management station comprising:

an interface to connect to a management transport medium;

a processor; and

a computer readable medium accessible by the processor, the computer readable medium storing a set of computer instructions comprising instructions executable by the processor to;

provide an interface to allow a user to modify a set of configuration information for a routing device, wherein the configuration information maps between host devices connected to a serial transport medium and remote storage devices connected a second transport medium and is configured for use by the routing device to implement access controls in accordance with the configuration information and to allow access from host devices to the remote storage devices through using native low level block protocol;

update the set of configuration information based on input from the user; and

communicate the set of configuration information to the routing device over the management transport medium.

21. The management station of claim 20, wherein the management station wherein the configuration information is operable to configure the routing device to maintain an allocation of subsets of storage space to associated hosts device connected to the serial transport medium so that each subset is only accessible by the associate host device.

22. The management station of claim 20, wherein the management transport medium is one of the serial or second transport media.

23. The management station of claim 20, wherein the management transport medium is an Ethernet transport medium.

24. The management station of claim 20, wherein the map maps from a host identification to a virtual address for at least a portion of an associated remote storage device.

25. The management station of claim 20, wherein the map maps from a host identification to a physical address for at least a portion of an associated remote storage device.

26. A software product comprising a computer readable medium storing a set of computer instructions comprising instructions executable by a processor to:

provide an interface to allow a user to modify a set of configuration information for a routing device that maps between host devices connected to a first transport medium and remote storage devices connected a second transport medium, wherein the set of configuration information defines a map that maps the host devices to the remote storage devices and that is for use by the routing device to implement access controls to allow access from host devices to the remote storage devices through using native low level block protocol; and

communicate the set of configuration information to the routing device.

27. The software product of claim 26, wherein map maps from a host identification to an address for at least a portion of an associated remote storage device.

28. A storage network comprising:

a first transport medium;

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

a set of hosts connected to the first transport medium, wherein each host is configured to issue requests according to a native low level block protocol;

a set of remote storage devices connected to the second transport medium;

a routing device configured to;

maintain a set of configuration information that associates hosts connected to the transport medium with storage space on remote storage devices connected to the second transport medium and allow modification of the configuration information by a remote storage device;

provide virtual local storage to the host devices in a manner so that the remote storage devices appear to the host devices so as to have the appearance of locally attached storage;

receive requests from the host devices according to the native low level block protocol; and

for a request received from an issuing host, access a set of configuration information and forward using a low level block protocol the request to a remote storage device if the issuing host is associated with the requested storage space according to the configuration information.

29. The storage network of claim 28, wherein the hosts comprise a set of workstations.

30. The storage network of claim 28, wherein the remote storage devices comprise hard disk drives.

31. The storage network of claim 28, wherein the set of configuration information associates host identifiers with a virtual addresses for storage space on the set of remote storage devices.

32. The storage network of claim 31, wherein the set of configuration information associates the virtual addresses with physical addresses for storage space on the set of remote storage devices.

33. The storage network of claim 28, wherein the configuration information allocates subsets of storage space to associated hosts and wherein the routing device is configured to only allow access to a subset of storage space to associated hosts.

34. The storage network of claim 28, wherein the routing device stores the configuration as one or more tables in Flash memory.

35. The storage network of claim 28, wherein the request is a SCSI request.

36. The storage network of claim 35, wherein the first transport medium is an Ethernet transport medium, wherein the SCSI request is encapsulated in an iSCSI transport protocol, and wherein the routing device receives an iSCSI communication from the iSCSI device and forwards the SCSI request to the remote storage device if the SCSI request is allowed.

37. The storage network of claim 28, wherein the remote storage devices comprise SCSI, Fibre Channel, ATA, SATA or Serial Attached SCSI storage devices and wherein the supervisor unit forwards a low level block protocol command to the remote storage devices.

38. A storage network, comprising:

a first transport medium;

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

a plurality of workstations connected to the first transport medium;

a plurality of remote storage devices connected to the second transport medium; and

a routing device interfacing between the first transport medium and the second transport medium, the routing device providing virtual local storage on the remote storage devices to the workstations and operable;

to map between the workstations and the remote storage devices;

to implement access controls for storage space on the remote storage devices; and

to allow access from the workstations to the remote storage devices using low level, block protocol in accordance with the mapping and access controls.

39. The storage network of claim 38, wherein the access controls include an allocation of subsets of storage space to associated workstations, wherein each subset is only accessible by the associated workstation.

40. The storage network of claim 38, wherein the map creates a path between unique identifiers associated with each of the workstations to unique identifiers associated with the remote storage devices.

41. The storage network of claim 38, wherein the remote storage devices comprise SCSI storage devices.

42. The storage network of claim 38, wherein the remote storage devices comprise Fibre Channel storage devices.

43. The storage network of claim 38, wherein the remote storage devices comprise ATA storage devices.

44. The storage network of claim 38, wherein the remote storage devices comprise SATA storage devices.

45. The storage network of claim 38, wherein the remote storage devices comprise SAS storage devices.

46. The storage network of claim 38, wherein the first transport medium is an Ethernet transport medium operable to transport iSCSI protocol communications.

47. The storage network of claim 38, wherein the first transport medium is a Fibre Channel transport medium operable to transport Fibre Channel protocol communications.

48. A storage network method, comprising:

at a workstation connected to a serial transport medium, sending a communication containing a command according to a native low level block protocol to virtual local storage;

at a routing device interfacing between the first transport medium and a second transport medium;

mapping between workstations connected to the serial transport medium and remote storage devices connected to the second transport medium;

receiving the communication from the workstation;

determining if the workstation is associated storage space on the remote storage devices; and

forwarding the native low level block command to an appropriate remote storage device if the workstation is associated with storage space on that remote storage device; and

at a remote storage device connected to the routing device, returning a response according to the native low level block protocol if the command is received.

49. The storage network method of claim 48, further comprising remapping between workstations and remote storage devices.

50. The storage network method of claim 48, further comprising encapsulating the native low level block protocol in a transport protocol at the issuing workstation.

51. The storage network of claim 50, wherein the native low level block protocol is encapsulated in one of an iSCSI protocol or a Fibre Channel protocol at the workstation.

52. A data storage gateway capable of interfacing with and providing connectivity and mapping between a serial interface connected to a first transport medium and a second interface connected to a second transport medium, the data storage gateway comprising:

a set of remote storage devices;

a configurable gateway device in communication with the remote storage device, the routing device configured to;

maintain a set of configuration information that associates each of a set of hosts with a subset of storage space on the set of remote storage devices;

present to each host device the subsets of storage space associated with that host device according to the configuration information as if the subsets of storage space are locally attached to that host device;

implement access controls to the storage space in accordance with configuration information; and

allow each host to communicate with remote storage devices containing subsets of storage space associated with that host using a native low level block protocol.

53. The data storage gateway of claim 52, wherein the gateway device is configured to receive a communication containing a low level block protocol command from an issuing host, determine if the issuing host is associated with target storage space based on a host identification for the issuing host and an address associated with the target storage space, and if the issuing host is associated with the target storage space, forward the native low level block command to the remote storage device containing the subset of storage space.

54. The data storage gateway of claim 52, wherein the gateway device is configurable to reallocate subsets of storage space to host devices.

55. The data storage gateway of claim 52, wherein the remote storage devices comprise SCSI storage devices.

61. The data storage gateway of claim 52, wherein the first transport medium is a Fibre Channel transport medium operable to transport Fibre Channel protocol communications.

56. The data storage gateway 52, wherein the remote storage devices comprise Fibre Channel storage devices.

57. The data storage gateway 52, wherein the remote storage devices comprise ATA storage devices.

58. The data storage gateway 52, wherein the remote storage devices comprise SATA storage devices.

59. The data storage gateway 52, wherein the remote storage devices comprise SAS storage devices.

60. The data storage gateway 52, wherein the serial transport medium is an Ethernet transport medium operable to transport iSCSI protocol communications.