SMB2 scaleout

• US 10,630,781 B2
• Filed: 08/25/2015
• Issued: 04/21/2020
• Est. Priority Date: 09/09/2011
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Inventors: Kruse, David M., Lovinger, Daniel E., Jolly, Thomas E., Pinkerton, James T., George, Mathew, Battepati, Roopesh C., Shang, Mingdong
• Primary Examiner(s): Meky, Moustafa M
• Assistant Examiner(s): Mendaye, Kidest
• Application Number:
  US14/834,959
• Publication Number:
  US 20150365482A1
• Time in Patent Office: 1,701 Days
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46
• CPC Class Codes: H04L 67/1014 based on the content of a request
• CPC Class Codes: H04L 67/1038 Load balancing arrangements to avoid a single path through 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 67/141 Setup of application sessions admission control or resource allocation in data switching networks H04L47/70
• CPC Class Codes: H04L 67/148 Migration or transfer of sessions
• CPC Class Codes: H04L 69/14 Multichannel or multilink protocols

Abstract

Systems and methods are disclosed for clients and servers operating in a scaled cluster environment. Efficiencies are introduced to the process of connecting a client to a clustered environment by providing the client with the ability to attempt a connection with multiple servers in parallel. Servers operating the in the clustered environment are also capable of providing persistent storage of file handles and other state information. Ownership of the state information and persistent handles may be transferred between servers, thereby providing clients with the opportunity to move from one server to another while maintaining access to resources in the clustered environment.

Claims

1. A computer system for providing persistent handles, the system comprising:

at least a first server and a second server, wherein the first sever and the second server are part of a server cluster;

the first server configured to;

receive a connection request from a client, wherein the connection request comprises a session setup request that identifies a previously established session with the second server;

in response to receiving the connection request from the client, send, to the second server, an ownership request of the previously established session, wherein the ownership request comprises the session setup request and a session ID associated with the previously established session; and

the second server configured to;

receive the ownership request from the first server, wherein the ownership request comprises a session set up request;

in response to receiving the ownership request, ensuring that there are no pending operations on one or more resources associated with the previously established session; and

when there are no pending operations, invalidating the previously established session by at least closing one or more open handles associated with the previously established session.

2. The computer system of claim 1, wherein invalidating the session comprises at least one of:

closing at least one open handle associated with the previously established session; and

releasing at least one lock on the one or more resources associated with the previously established session.

3. The computer system of claim 2, wherein the second server is further configured to transfer ownership of the previously established session to the first server.

4. The computer system of claim 3, wherein transferring the previously established session comprises transferring ownership of the one or more resources associated with the previously established session to the first server.

5. The computer system of claim 3, wherein transferring the previously established session comprises transferring the one or more resources associated with the previously established session to the first server.

6. The computer system of claim 1, wherein ensuring that there are no pending operations comprises at least one of:

completing one or more pending operations; and

cancelling the one or more pending operations.

7. A method for transferring a previously established session in a server cluster environment, the method comprising:

receiving, at a first node in the server cluster, an ownership request from a second node in the server cluster to transfer a previously established session to the second node, wherein the ownership request comprises a session set up request, and wherein the first node conducted the previously established session with a client prior to losing a connection with the client;

in response to receiving the ownership request, determining whether there are pending operations for one or more resources associated with the previously established session; and

when there are no pending operations, invalidating the previously established session by at least closing one or more open handles associated with the previously established session.

8. The method of claim 7, wherein the request to transfer the previously established session comprises a session identifier, wherein the session identifier is used to identify the previously established session.

9. The method of claim 7, further comprising, when there are pending operations of the one or more resources associated with the previously established session, waiting for the pending operations to complete.

10. The method of claim 7, further comprising, when there are pending operations for the one or more resources associated with the previously established session, canceling the pending operations.

11. The method of claim 7, wherein invalidating the previously established session comprises at least one of:

closing at least one open handle associated with the previously established session; and

releasing at least one lock on the one or more resources associated with the previously established session.

12. The method of claim 7, further comprising transferring ownership of the previously established session to the second node.

13. The method of claim 12, wherein transferring the previously established session comprises transferring ownership of the one or more resources associated with the previously established session to the second node.

14. The method of claim 12, wherein transferring the previously established session comprises transferring the one or more resources associated with the previously established session to the first node.

15. A computer storage device encoding computer-executable instructions that, when executed by at least one processor, perform a method comprising:

receiving, at a first node in the server cluster, an ownership request from a second node in the server cluster to transfer a previously established session to the second node, wherein the ownership request comprises a session set up request and a session id associated with the previously established session, and wherein the first node conducted the previously established session with a client prior to losing a connection with the client;

in response to receiving the ownership request, determining whether there are pending operations for one or more resources associated with the previously established session; and

when there are no pending operations, invalidating the previously established session by at least closing one or more open handles associated with the previously established session.

16. The computer storage device of claim 15, wherein the request to transfer the previously established session comprises a session identifier, wherein the session identifier is used to identify the previously established session.

17. The computer storage device of claim 15, wherein invalidating the previously established session comprises at least one of:

closing at least one open handle associated with the previously established session; and

releasing at least one lock on the one or more resources associated with the previously established session.

18. The computer storage device of claim 15, wherein the method further comprises transferring ownership of the previously established session to the second node.

19. The computer storage device of claim 18, wherein transferring the previously established session comprises transferring ownership of the one or more resources associated with the previously established session to the second node.

20. The computer storage device of claim 18, wherein transferring the previously established session comprises transferring the one or more resources associated with the previously established session to the first node.