Storage virtualization in a storage area network

• US 6,898,670 B2
• Filed: 04/04/2001
• Issued: 05/24/2005
• Est. Priority Date: 04/18/2000
• Status: Expired due to Term

• Current Assignee: NetApp, Inc.
• Original Assignee: StoreAge Networking Technologies Ltd. (Broadcom, Inc.)
• Inventors: Nahum, Nelson
• Primary Examiner(s): Nguyen, Than
• Application Number:
  US10/257,426
• Publication Number:
  US 20030236945A1
• Time in Patent Office: 1,511 Days
• Field of Search: 711/111, 711/112, 711/114, 711/202, 711/206, 711/207, 711/147, 711/149, 709212-216
• US Class Current: 711/114
• CPC Class Codes: G06F 12/08 in hierarchically structured memory systems, e.g. virtual memory systems
• 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 3/0665 at area level, e.g. provisioning of virtual or logical volumes
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]

Abstract

A distributed architecture for the virtualization of storage capacity in a Storage Area Network (SAN) and for the management of virtual and physical memory is described. There is provided a virtualization software computer program consisting of two portions, namely virtualization and translation, each portion residing in a different location but both portions operating interactively. A SAN coupling an array of hosts (1) via a Network Switch (2) to an array of storage devices (4) is equipped with a Storage Virtualization Manager (3). The SVM operating the virtualization computer software handles physical storage capacity virtualization and metadata management. The Network Switch routes storage I/O operations between the hosts and the storage devices, while the translation software resides in a processor, in either a host or elsewhere on the Network Switch SAN. Although the Network Switch and the SVM decouple tasks to relieve load and prevent bottlenecks, practical implementation permits to design the Network Switch, the processor(s) operating the virtualization program, and the SVM in many configurations spanning from distributed to integrated packaging. The virtualization software also supports real time configuration adaptation of changes occurring in the configuration of the array of hosts and of storage devices of the SAN.

Claims

1. A method for storage virtualization in a Storage Area Network (SAN) comprising an array of hosts (1) coupled to an array of storage devices (4) via a Network Switch (2) operative for routing storage I/O operations between the array of hosts and the array of storage devices, the storage devices having a storage capacity, and the array of hosts, the array of storage devices and the Network Switch being coupled together in a storage network (5′

), and the array of hosts being coupled to a plurality of user workstations (7) on a user network (6′

), the method comprising the steps of;

coupling a Storage Virtualization Manager (SVM) (3) by a storage network link (5) to the Network Switch on the storage network, and coupling the SVM by a user network link (6) to the user network, the SVM being configured for virtualization of the storage capacity and for managing metadata, and

operating the SVM for virtualization of the storage capacity and for managing metadata,

whereby virtualization of the storage capacity and managing metadata are decoupled from routing storage I/O operations.

2. The method according to claim 1, further comprising the step of:

operating a virtualization computer program comprising a first configuration portion operating in the SVM (3) and a second translation portion (60) operating in association with at least one host of the array of hosts.

3. The method according to claim 2, further comprising the step of:

operating the second translation portion of the virtualization computer program in each host of the array of hosts.

4. The method according to claim 2, further comprising the step of:

operating the second translation portion of the virtualization computer program on a processor associated with at least one host of the array of hosts.

5. The method according to claim 2, further comprising the step of:

operating the first configuration portion and the second translation portion of the virtualization computer program in interactive operative association.

6. The method according to claim 2, further comprising the step of:

operating the virtualization computer program for supporting real time configuration adaptation of the SAN in response to a configuration change occurring in the array of hosts.

7. The method according to claim 2, further comprising the step of:

operating the virtualization computer program for supporting real time configuration adaptation of the SAN in response to a configuration change occurring in the array of storage devices.

8. The method according to claim 2, further comprising the step of:

operating computer program control functions comprised in the virtualization computer program for management of storage virtualization and for configuration management of both the array of hosts and the array of storage devices.

9. The method according to claim 8, further comprising the step of:

enabling a System Administrator to manage the computer program control functions by operating a workstation coupled to the user network.

10. The method according to claim 8, further comprising the step of:

managing the computer program control functions in operative association with at least one user application computer program.

11. The method according to claim 8, further comprising the step of:

managing the computer program control functions in association with at least one storage application computer program.

12. The method according to claim 1, further comprising the step of:

configuring both the Network Switch and the SVM for incorporation into a joint housing.

13. The method according to claim 1, further comprising the step of:

accommodating one chosen host of the array of hosts for incorporation therein of the SVM, the SVM being configured for operative association with the array of hosts and for coupling thereto via the user network.

14. The method according to the claim 2, further comprising the step of:

configuring a host coupled to the user network to operate the configuration computer program in operative association with the Network Switch and with the translation portion of the virtualization computer program operating on at least one processor coupled to the storage network.

15. A method for storage virtualization in a Storage Area Network (SAN) comprising an array of hosts (1) coupled to an array of storage devices (4) having a storage capacity, and an Enhanced Network Switch (2E) operative for routing storage I/O operations between the array of hosts and the array of storage devices, and the array of hosts, the array of storage devices and the Enhanced Network Switch being coupled together in a storage network (5′

), and the array of hosts being coupled to a plurality of user workstations (7) in a user network (6′

), the method comprising the steps of;

forming an Upgraded Network Switch (UNS) (2*) to upgrade the Enhanced Network Switch (2E), the UNS integrating an adjusted Storage Virtualization Manager (SVM) (3/500) configured for and operative for virtualization of the storage capacity and for managing metadata, the (UNS) comprising a first Enhanced Network Switch portion and a second adjusted SVM portion,

coupling the second adjusted SVM portion by a storage network link (5) to the first Enhanced Network Switch portion and by a user network link (6) to the user network, and

operating the second adjusted SVM portion for virtualization of the storage capacity and for managing metadata,

whereby virtualization of the storage capacity and managing of metadata are decoupled from routing storage I/O operations.

16. The method according to claim 15, wherein the UNS (2*) further comprises:

coupling a plurality of ports of the Enhanced Network Switch comprising coupling a first portion of ports (1*) to the hosts (1) and a second portion of ports (4*) to the storage devices (4), and coupling by storage network link (5) to each port of the first portion of ports and to each port of the second portion of ports, respectively, at least one host and at least one storage device, and

coupling a processing instance (66) to each port of at least the first portion of ports, and to the second adjusted SVM portion.

17. The method according to claim 15, further comprising the steps of:

operating a virtualization computer program comprising a first configuration portion operative on the second adjusted SVM portion and a second translation portion operative on the processing instance coupled to each port of the first portion of ports.

18. The method according to claim 17, further comprising the steps of:

operating independently the second translation portion of the virtualization computer program on the processing instance coupled to each port of the first portion of ports.

19. The method according to claim 17, further comprising the step of:

running the first configuration portion and the second translation portion of the virtualization computer program in interactive operative association.

20. The method according to claim 17, further comprising the step of:

operating the virtualization computer program to support real time configuration adaptation of the SAN in response to a configuration change occurring in the array of hosts.

21. The method according to claim 17, further comprising the step of:

operating the virtualization computer program to support real time configuration adaptation of the SAN in response to a configuration change occurring in the array of storage devices.

22. The method according to claim 17, further comprising the step of:

operating computer program control functions comprised in the virtualization computer program for management of storage virtualization and for configuration management of both the array of hosts and the array of storage devices.

23. The method according to claim 22, further comprising the step of:

enabling a System Administrator to manage the computer program control functions by operating a workstation coupled to the user network.

24. The method according to claim 22, further comprising the step of:

managing the computer program control functions in operative association with at least one user application computer program.

25. The method according to claim 22, further comprising the step of:

managing the computer program control functions in association with at least one storage application computer program.

26. The method according to claim 15, further comprising the step of:

configuring both the first Enhanced Network Switch portion and the second adjusted SVM portion for incorporation into a joint housing.

27. A system for storage virtualization in a Storage Area Network (SAN) comprising an array of hosts (1), an array of storage devices (4) with a storage capacity, and a Network Switch (2) operative for routing storage I/O operations between the array of hosts and the array of storage devices, the array of hosts being coupled to the array of storage devices via the Network Switch in a storage network (5′

), and the array of hosts being coupled to a user network (6) comprising a plurality of user workstations (7), the system comprising;

a Storage Virtualization Manager (SVM) (3) coupled by a storage network link (5) to the Network Switch on the storage network, and the SVM being coupled by a user network link (6) to the user network, the SVM being configured for and operating for virtualization of the storage capacity and for managing metadata,

whereby virtualization of the storage capacity and managing metadata are decoupled from routing storage I/O operations.

28. The system according to claim 27, further comprising:

a virtualization computer program comprising a first configuration portion running on the SVM and a second translation portion operating in association with at least one host of the array of hosts.

29. The system according to claim 28, further comprising:

each host of the array of hosts operating the second translation portion of the virtualization software computer program.

30. The system according to claim 28, further comprising:

a processor associated with at least one host of the array of hosts for operating the second translation portion of the virtualization computer program.

31. The system according to claim 28, further comprising:

the first configuration portion and the second translation portion of the virtualization computer program being coupled in interactive operative association.

32. The system according to claim 28, further comprising:

a real time configuration adaptation of the SAN in response to a configuration change occurring in the array of hosts, the real time configuration adaptation being supported by operation of the virtualization computer program.

33. The system according to claim 28, further comprising:

a real time configuration adaptation of the SAN in response to a configuration change occurring in the array of storage devices, the real time configuration adaptation being supported by operation of the virtualization computer program.

34. The system according to claim 28, further comprising:

computer program control functions comprised in the virtualization computer program being operated for management of storage virtualization and for configuration management of both the array of hosts and the array of storage devices.

35. The system according to claim 34, further comprising:

a System Administrator for managing the computer program control functions by operating a workstation coupled to the user network.

36. The system according to claim 34, further comprising:

at least one user application computer program for managing the computer program control functions.

37. The system according to claim 34, further comprising:

at least one storage application computer program for managing the computer program control functions.

38. The system according to claim 27, further comprising:

a joint housing configured for incorporation therein of both the Network Switch and the SVM.

39. The system according to claim 27, further comprising:

one chosen host of the array of hosts being configured for incorporation therein of the SVM, and the SVM being coupled in operative association to the Network Switch via the storage network.

40. The system according to claim 28, further comprising:

a host coupled to the user network and being configured to operate the configuration computer program in operative association with the Network Switch and with the translation portion of the virtualization computer program operating on at least one processor coupled to the storage network.

41. A system for a Storage Area Network (SAN) comprising an array of hosts (1), an array of storage devices (4) having a storage capacity, and an Enhanced Network Switch (2E) operative for routing I/O operations between the array of hosts and the array of storage devices, the array of hosts being coupled to the array of storage devices via the Enhanced Network Switch, the array of storage devices and the Enhanced Network Switch being coupled together in a storage network (5′

), and the array of hosts being coupled to a user network (6′

) comprising a plurality of user workstations (7), the system comprising;

an Upgraded Network Switch (UNS) 2* created to upgrade the Enhanced Network Switch, the UNS integrating an adjusted Storage Virtualization Manager (SVM) (3/500) configured for and operative for virtualization of the storage capacity and for managing metadata, the UNS comprising a first Upgraded Network Switch portion and a second adjusted SVM portion, and

a storage network link (5) coupling the first Enhanced Network Switch portion to the second adjusted SVM portion and a user network link (6) coupling the second adjusted SVM portion to the user network,

whereby virtualization of the storage capacity and managing metadata are decoupled from routing storage I/O operations.

42. The system according to claim 41 wherein the UNS (2*) further comprises:

a plurality of ports comprising a first portion of ports (1*) for coupling to the hosts (1) and a second portion of ports (4*) for coupling to the storage devices (4), and coupling by storage link (5) to each port of the first portion of ports and to each port of the second portion of ports, respectively, at least one host and at least one storage device, and

at least one processing instance (66) being coupled to each port of at least the first portion of ports, and to the second adjusted SVM portion.

43. The system according to claim 41, further comprising:

a virtualization computer program comprising a first configuration portion operative on the second adjusted SVM portion and a second translation portion operative on the at least one processor coupled to each port of the first portion of ports.

44. The system according to claim 43, further comprising:

each at least one processor coupled to each port of the first portion of ports independently operating the second translation portion of the virtualization computer program.

45. The system according to claim 44, further comprising:

an interactive operative association coupling the first configuration portion and the second translation portion of the virtualization computer program.

46. The system according to claim 43, further comprising:

a real time configuration adaptation of the SAN in response to a configuration change occurring in the array of hosts, the real time configuration adaptation being supported by operation of the virtualization computer program.

47. The system according to claim 43, further comprising:

a real time configuration adaptation of the SAN in response to a configuration change occurring in the array of storage devices, the real time configuration adaptation being supported by operation of the virtualization computer program.

48. The system according to claim 43, further comprising:

computer program control functions comprised in the virtualization computer program for management of storage virtualization and for configuration management of both the array of hosts and the array of storage devices.

49. The system according to claim 48, further comprising

a System Administrator for managing the computer program control functions by operating a workstation coupled to the user network.

50. The system according to claim 48, further comprising:

at least one user application computer program for managing the computer program control functions.

51. The system according to claim 48, further comprising:

at least one storage application computer programs operating the management of the computer program control functions.

52. The system according to claim 41, further comprising:

a joint housing configured for incorporation therein of the first Enhanced Network Switch portion and the second adjusted SVM portion.