Servicing of network software components of nodes of a cluster storage system

Patent metadata

Field	Value
Publication number	US-10404711-B2
Application number	US-201715441292-A
Country	US
Kind code	B2
Filing date	Feb 24, 2017
Priority date	Feb 17, 2009
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

Described herein are method and apparatus for servicing software components of nodes of a cluster storage system. During data-access sessions with clients, client IDs and file handles for accessing files are produced and stored to clients and stored (as session data) to each node. A serviced node is taken offline, whereby network connections to clients are disconnected. Each disconnected client is configured to retain its client ID and file handles and attempt reconnections. Session data of the serviced node is made available to a partner node (by transferring session data to the partner node). After clients have reconnected to the partner node, the clients may use the retained client IDs and file handles to continue a data-access session with the partner node since the partner node has access to the session data of the serviced node and thus will recognize and accept the retained client ID and file handles.

First claim

We claim:

1. A first node, comprising:
a memory containing a machine readable medium comprising machine executable code having stored thereon instructions for facilitating network component servicing; and
a processor coupled to the memory, the processor configured to execute the machine executable code to cause the processor to:
generate a client identifier following authentication of credentials included in a connection request received from a client and return the generated client identifier to the client;
send, to the client, generated session data comprising a handle for a file on a shared storage and the client identifier, in response to an access request received from the client to access the file, wherein the access request comprises the client identifier;
migrate the generated session data to an aggregate of the shared storage that is accessible by a second node to facilitate approval by the second node of another connection request from the client comprising the client identifier; and
receive service to a software component from the second node subsequent to migrating the session data.

2. The first node of claim 1 , wherein the request comprises a virtual address of the file and the processor is further configured to execute the machine executable code to cause the processor to translate the virtual address to a physical address of the file.

3. The first node of claim 1 , wherein the processor is further configured to execute the machine executable code to cause the processor to take the first node offline by forcing a network disconnection with the client in order to service the first node.

4. The first node of claim 3 , wherein the processor is further configured to execute the machine executable code to cause the processor to service another access request for the file received from the client subsequent to completion of the received service, upon determining the client has permission to access the file based on a comparison of the session data to the handle and the client identifier in the another access request and without re-authenticating the credentials.

5. The first node of claim 1 , wherein the session data further comprises permission and lock state data associated with the handle.

6. The first node of claim 1 , wherein the processor is further configured to execute the machine executable code to cause the processor to service another access request for another file received from another client and specifying another handle for the another file and another client identifier, upon determining the another client is authenticated based on a comparison of another migrated session data to the another handle and the another client identifier.

7. A method comprising:
generating, by a first node, a client identifier following authentication of credentials included in a connection request received from a client and returning the generated client identifier to the client;
sending, by the first node and to the client, generated session data, comprising a handle for a file on a shared storage and the client identifier, in response to an access request received from the client to access the file, wherein the access request comprises the client identifier;
migrating, by the first node, the generated session data to an aggregate of the shared storage that is accessible by a second node to facilitate approval by the second node of another connection request from the client comprising the client identifier; and
receiving, by the first node, service to a software component from the second node subsequent to migrating the session data.

8. The method of claim 7 , further comprising servicing, by the first node, another access request for another file received from another client and specifying another handle for the another file and another client identifier, upon determining the another client is authenticated based on a comparison of another migrated session data to the another handle and the another client identifier.

9. The method of claim 7 , wherein the request comprises a virtual address of the file and the method further comprises translating the virtual address to a physical address of the file.

10. The method of claim 7 , further comprising taking, by the first node, the first node offline by forcing a network disconnection with the client in order to service the first node.

11. The method of claim 10 , further comprising servicing, by the first node, another access request for the file received from the client subsequent to completion of the received service, upon determining the client has permission to access the file based on a comparison of the session data to the handle and the client identifier in the another access request and without re-authenticating the credentials.

12. The method of claim 7 , wherein the session data further comprises permission and lock state data associated with the file handle.

13. A non-transitory machine readable medium having stored thereon instructions for facilitating network component servicing comprising machine executable code which when executed by at least one machine, causes the machine to:
generate a client identifier following authentication of credentials included in a connection request received from a client and return the generated client identifier to the client;
send, to the client, generated session data, comprising a handle for a file on a shared storage and the client identifier, in response to an access request received from the client to access the file, wherein the access request comprises the client identifier;
migrate the generated session data to an aggregate of the shared storage that is accessible by a second node to facilitate approval by the second node of another connection request from the client comprising the client identifier; and
receive service to a software component from the second node subsequent to migrating the session data.

14. The non-transitory machine readable medium of claim 13 , wherein the request comprises a virtual address of the file and the machine executable code when executed by the machine, further causes the machine to translate the virtual address to a physical address of the file.

15. The non-transitory machine readable medium of claim 13 , wherein the machine executable code when executed by the machine, further causes the machine to take the first node offline by forcing a network disconnection with the client in order to service the first node.

16. The non-transitory machine readable medium of claim 15 , wherein the machine executable code when executed by the machine, further causes the machine to service another access request for the file received from the client subsequent to completion of the received service, upon determining the client has permission to access the file based on a comparison of the session data to the handle and the client identifier in the another access request and without re-authenticating the credentials.

17. The non-transitory machine readable medium of claim 13 , wherein the session data further comprises permission and lock state data associated with the file.

18. The non-transitory machine readable medium of claim 13 , wherein the machine executable code when executed by the machine, further causes the machine to service another access request for another file received from another client and specifying another handle for the another file and another client identifier, upon determining the another client is authenticated based on a comparison of another migrated session data to the another handle and the another client i

Assignees

• Netapp Inc

Inventors

• Le Nam
• Mu Paul Yuedong
• Boyles John Russell
• Hoffman John Eric

Classifications

• G06F16/10

  File systems; File servers · CPC title

• G06F3/0637

  Permissions · CPC title

• G06F3/0635

  by changing the path, e.g. traffic rerouting, path reconfiguration · CPC title

• G06F3/0607

  by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device · CPC title

• H04L63/083

  using passwords (cryptographic mechanisms or cryptographic arrangements for entity authentication using a predetermined code H04L9/3226) · CPC title