Pooling and provisioning storage resources in a storage network

• US 7,539,824 B2
• Filed: 11/23/2005
• Issued: 05/26/2009
• Est. Priority Date: 09/28/2001
• Status: Expired due to Term

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: EMC Corporation (Dell Technologies Inc.)
• Inventors: Saxena, Sanjay, Lolayekar, Santosh C., Maranon, Renato E., Cheng, Yu-Ping
• Primary Examiner(s): Portka; Gary J
• Application Number:
  US11/286,168
• Publication Number:
  US 20060075191A1
• Time in Patent Office: 1,280 Days
• Field of Search: None
• US Class Current: 711/148
• CPC Class Codes: G06F 3/0613 in relation to throughput
• CPC Class Codes: G06F 3/0631 by allocating resources to storage systems
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1008 based on parameters of servers, e.g. available memory or workload monitoring of computer activity G06F11/30
• CPC Class Codes: H04L 67/101 based on network conditions
• CPC Class Codes: H04L 67/1014 based on the content of a request
• CPC Class Codes: H04L 67/1034 Reaction to server failures by a load balancer
• 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 67/61 taking into account QoS or priority requirements

Abstract

A system in accordance with an embodiment of the invention provides Quality of Service (QoS) for Storage Access. Such QoS is partially enabled in one embodiment by the automatic pooling of storage devices and provisioning virtual targets from those pools. QoS is enforced in one embodiment by keeping the bandwidth for each connection within a specified range, and particularly, by controlling the number of allowed concurrent requests from an initiator. Load balancing is also provided in one embodiment, improving response times for requests, further easing the ability to provide QoS.

Claims

1. A method for use by a storage switch in a storage area network, the method comprising:

automatically obtaining by the switch information about performance characteristics of a physical device in communication with the switch, the physical device including one or more logical units (LUs);

based on the performance characteristics, assigning by the switch the LUs for the physical device to one of a plurality of storage pools;

receiving at the switch a request from a user for a virtual target, the request including a requested characteristic of the virtual target and a requested storage pool from which to provision the virtual target, the requested storage pool being accessible only to selected ones of requesting users that are members of a predetermined group;

automatically determining by the switch if LUs of physical devices assigned to the requested storage pool are available that meet the characteristic requested; and

if the LUs of physical devices are available and said user is a member of said predetermined group permitted access to said requested storage pool, provisioning by the switch the virtual target from said physical devices.

2. The method of claim 1 further comprising provisioning by the switch said virtual target using the LUs in the requested storage pool in accordance with criteria selected by said user.

3. The method of claim 1 further comprising classifying by the switch the LUs according to a policy based on the performance characteristics, the requested storage pool being defined by the policy.

4. The method of claim 1 further comprising storing by the switch an LU object in the switch for each LU, the LU object comprising information about the LU.

5. The method of claim 1 further comprising automatically discovering by the switch the physical device upon the physical device being placed in communication with the switch.

6. The method of claim 1, wherein said automatically obtaining performance characteristics comprises obtaining performance characteristics of a plurality of physical devices in communication with the switch, each physical device including one or more LUs;

and the method further comprises classifying by the switch LUs based on the performance characteristics of each physical device according to a respective one of a plurality of policies, assigning the LUs for each physical device to said one of said plurality of storage pools, and provisioning said virtual target using LUs assigned to a selected storage pool.

7. The method of claim 6, wherein each of the plurality of storage pools is defined by a respective policy, and wherein the respective policy encompasses the performance characteristics of the LUs assigned to the storage pool.

8. The method of claim 6 further comprising associating by the switch the virtual target with a user domain, and associating the user domain with a second virtual target provisioned by a second storage switch.

9. A method for use by a storage switch in a storage area network, the method comprising:

receiving at the switch a request from a user for a virtual target, the request including a requested characteristic of the virtual target and a requested storage pool from which to provision the virtual target, the storage pool being accessible only to selected ones of requesting users that are members of a predetermined group;

automatically determining by the switch if physical storage resources assigned to the storage pool are available that meet the characteristic requested; and

if the physical storage resources are available and said user is a member of said predetermined group permitted access to said requested storage pool, provisioning by the switch the virtual target from said physical resources.

10. The method of claim 9, wherein the characteristic includes one or more of a size and a desired availability of the virtual target, and wherein said provisioning the virtual target further comprises provisioning a virtual target with said characteristic.

11. The method of claim 9, wherein said provisioning the virtual target comprises using resources from said storage pool, the resources being classified by a policy, and the storage pool being accessible to a selected set of connections.

12. The method of claim 9 further comprising provisioning by the switch an initiator connection from an initiator to the virtual target.

13. The method of claim 12, wherein said provisioning an initiator connection comprising receiving by the switch a request for a connection from the initiator to the virtual target, the request having a specified bandwidth characteristic.

14. The method of claim 12 further comprising creating a quality of service policy for storage access for the connection from the initiator to the virtual target, and wherein said provisioning of the virtual target comprises provisioning the virtual target in accordance with a first set of parameters;

and provisioning the initiator connection comprises provisioning by the switch the initiator connection in accordance with a second set of parameters.

15. The method of claim 9 further comprising associating by the switch the virtual target with a user domain, and associating the user domain with a second virtual target provisioned by a second storage switch.

16. A storage switch for use in a storage area network, comprising a utility program controlling the switch to receive a request from a user for a virtual target, the request including a requested characteristic of the virtual target and a requested storage pool from which to provision the virtual target, the requested storage pool being accessible only to selected ones of requesting users that are members of a predetermined group;

to automatically determine if physical devices assigned to the requested storage pool are available that meet the characteristic requested; and

, if the physical devices are available and said user is a member of said predetermined group permitted access to said requested storage pool, to provision by the switch the virtual target from said physical devices.

17. The storage switch of claim 16, wherein the utility program further controls

the switch to automatically obtain information about performance characteristics of a plurality of physical devices in communication with the switch, wherein each physical device includes one or more logical units (LUs), and to assign the LUs for each respective physical device to a respective one of a plurality of storage pools based on the performance characteristics of each physical device;

and

a database in communication with the utility program storing a plurality of LU objects, each LU object including at least some of the information obtained by the utility program, and wherein the database further includes a storage pool object for each respective storage pool, the storage pool object including a listing of the LUs in the respective storage pool.

18. The switch of claim 17, wherein the utility program further classifies the LUs of each physical device according to one of a plurality of policies.

19. The switch of claim 17, wherein the utility program further automatically discovers performance characteristics of each physical device upon the physical device being placed in communication with the switch.

20. The switch of claim 17, wherein the database further includes a plurality of virtual target objects, wherein each virtual target object includes a listing of extent objects that identifies the extents that form a particular virtual target.

21. The switch of claim 17, wherein the database further includes a user domain object comprising a listing of virtual targets that belong to the user domain.

22. A machine readable media having instructions stored thereon for execution by a storage switch in a storage area network to control the switch, said instructions controlling the switch to receive a request from a user for a virtual target, the request including a requested characteristic of the virtual target and a requested storage pool from which to provision the virtual target, the requested storage pool being accessible only to selected ones of requesting users that are members of a predetermined group;

to automatically determine if physical devices assigned to the requested storage pool are available that meet the characteristic requested; and

if the physical devices are available and said user is a member of said predetermined group permitted access to said requested storage pool, to provision by the switch the virtual target from said physical devices.

23. The machine readable media of claim 22, wherein said instructions further control the switch to automatically obtain information about one or more performance characteristics of a plurality of physical devices in communication with the switch, each physical device including one or more logical units (LUs);

to classify, based on a performance characteristic of each physical device, the respective LUs according to a respective one of a plurality of policies, to assign the respective LUs for each respective physical device to a respective one of a plurality of storage pools based upon said policies; and

to provision said virtual target using the LUs assigned to said requested storage pool.

24. The machine readable media of claim 23, wherein the instruction to provision comprises provisioning the virtual target in accordance with user-selected criteria.

25. The machine readable media of claim 23, wherein the instruction to provision comprises provisioning an initiator connection to another switch.

26. The machine readable media of claim 23, further including instructions for storing an LU object in the switch for each LU, wherein the LU object includes information about the LU.

27. The machine readable media of claim 23, wherein each respective storage pool is defined by a listing of the respective LUs assigned to it.

28. The machine readable media of claim 23, wherein each respective storage pool is defined by a respective policy, and wherein the respective policy encompasses the performance characteristics of the LUs assigned to the respective storage pool.

29. The machine readable media of claim 23 further comprising instructions for automatically discovering each of the plurality of physical devices upon each physical device being placed in communication with the switch.

30. The machine readable media of claim 23 further comprising instructions for associating the virtual target with a user domain.