Servicing of storage device software components of nodes of a cluster storage system
a storage system and software component technology, applied in the field of storage systems, can solve the problems of substantial node may deny access request processing, etc., and achieve the effect of reducing the disruption of client data-access sessions
Inactive Publication Date: 2016-04-07
NETWORK APPLIANCE INC
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[0011]In some embodiments, a servicing module residing on each node of the cluster provides less disruptive servicing of the software components of the nodes of a cluster. In these embodiments, each client is configured to retain its client ID and any file handles upon disconnection with a serviced node. Each client is also configured to automatically attempt to reconnect with a partner node and attempt to re-establish the data-access session with the partner node using the retained client ID and file handles. While the clients attempt to reconnect with the partner node, session data (comprising the client IDs and file handles) stored in the serviced node made available to the partner node (e.g., is transferred to the partner node). After the clients have reconnected to the partner node, the clients may use the retained client ID and file handles to continue the data-access session with the partner node. This is possible since the partner node now has access to the session data of the serviced node and thus will recognize and accept the retained client ID and file handles. The partner node may “recognize” the received client IDs and file handles by comparing and matching the received client IDs to the stored client IDs and file handles in the session data of the serviced node.
[0012]In the embodiments described herein, there is less disruption to clients accessing the cluster for data-access sessions during servicing of software components of the nodes of a cluster. In particular, when a serviced node is taken offline and clients are disconnected from the serviced node, the disconnected clients can continue the data-access sessions with the partner node using the previously obtained client IDs and file handles. As such, the client ID does not need to be reproduced through the connection authentication procedure and each file handle does not need to be reproduced through an access request validation procedure.
[0019]As such, the partner D-blade may use the original client ID and original file handles to validate access requests to previously opened files (by using the permission and lock state data). Thus the partner D-blade accesses the previously opened files using the original client ID and original file handles, without having to perform an access request validation procedure for the previously opened files and without having to produce new file handles for the previously opened files.
[0020]This process may be repeated for each node in the cluster, whereby each node in the cluster is serviced one after the other. By performing servicing on one node in the cluster at a time, the entire cluster system does not need to be taken offline, thus reducing disruption to client data-access.
Problems solved by technology
If the node does not recognize the client ID and file handle in an access request, the node may deny processing of the access request.
Thus, servicing of the D-blade and N-blade of each node typically causes substantial disruption to client data-access sessions.
Method used
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[0033]In the following description, numerous details are set forth for purpose of explanation. However, one of ordinary skill in the art will realize that the embodiments described herein may be practiced without the use of these specific details. In other instances, well-known structures and devices are shown in block diagram form in order not to obscure the description with unnecessary detail.
[0034]The description that follows is divided into seven sections. Section I describes a cluster environment in which some embodiments operate. Section II describes a storage operating system having a servicing module for servicing software components of nodes of the cluster. Section III describes a shared storage of the cluster. Section IV describes a client data-access session between a client and a node. Section V describes servicing of software components of nodes of the cluster. Section VI describes servicing of network software components (N-blades) of nodes of the cluster. Section VII ...
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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.
Description
CROSS REFERENCE TO RELATED APPLICATION[0001]The present application is a continuation of U.S. patent application Ser. No. 12 / 372,646, filed Feb. 17, 2009, entitled, “SERVICING OF STORAGE DEVICE SOFTWARE COMPONENTS OF NODES OF A CLUSTER STORAGE SYSTEM,” which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to storage systems, and particularly, to servicing of storage device software components of nodes of a cluster storage system.BACKGROUND OF THE INVENTION[0003]A storage system typically comprises one or more storage devices into which information may be entered, and from which information may be obtained, as desired. The storage system includes a storage operating system that functionally organizes the system by, inter alia, invoking storage operations in support of a storage service implemented by the system. The storage system may be implemented in accordance with a variety of storage architectures including, but not l...
Claims
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IPC IPC(8): H04L29/08
CPCH04L67/146H04L67/143H04L67/1097H04L63/08H04L63/10H04L67/10
InventorMU, PAUL YUEDONGLE, NAMHOFFMANN, JOHNBOYLES, JOHN
OwnerNETWORK APPLIANCE INC