Clustered filesystem with membership version support
First Claim
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1. A method for establishing cluster membership of computer system nodes sharing read/write access to storage devices via a storage area network, the method comprising:
- sending a withdrawal request from a node in a viable quorum cluster to two or more other nodes in the viable quorum cluster when the node is scheduled to withdraw from the viable quorum cluster to upgrade a version of an operating system software at the node, wherein the withdrawal request is sent according to a rolling upgrade, the rolling upgrade performed such that at least one other node of the two or more other nodes in the viable quorum cluster can receive the upgraded version of the operating system software at a later point in time, and the node withdraws from membership in the viable quorum cluster after sending the withdrawal request;
upgrading the version of the operating system software program at the node;
receiving a request for information from a leader node;
providing information identifying the upgraded version of the operating system software at the node to the leader node, wherein the leader node aggregates the upgraded operating system software version information and provides the aggregated information to all nodes in the viable quorum cluster when proposing a renewed membership in the viable quorum cluster andre-joining the viable quorum cluster after the leader node provides the aggregated information to all the nodes in the viable quorum cluster after the renewed membership in the viable quorum cluster has been proposed, wherein the renewed membership in the viable quorum cluster includes the node that previously withdrew from the viable quorum cluster and at least one other node, and the at least one other node formats a message consistent with the upgraded version of the operating system software at the node for transmission to the node.
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Abstract
A computer system with read/write access to storage devices creates a snapshot of a data volume at a point in time while continuing to accept access requests to the mirrored data volume by copying before making changes to the base data volume. Multiple snapshots may be made of the same data volume at different points in time. Only data that is not stored in a previous snapshot volume or in the base data volume are stored in the most recent snapshot volume.
183 Citations
20 Claims
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1. A method for establishing cluster membership of computer system nodes sharing read/write access to storage devices via a storage area network, the method comprising:
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sending a withdrawal request from a node in a viable quorum cluster to two or more other nodes in the viable quorum cluster when the node is scheduled to withdraw from the viable quorum cluster to upgrade a version of an operating system software at the node, wherein the withdrawal request is sent according to a rolling upgrade, the rolling upgrade performed such that at least one other node of the two or more other nodes in the viable quorum cluster can receive the upgraded version of the operating system software at a later point in time, and the node withdraws from membership in the viable quorum cluster after sending the withdrawal request; upgrading the version of the operating system software program at the node; receiving a request for information from a leader node; providing information identifying the upgraded version of the operating system software at the node to the leader node, wherein the leader node aggregates the upgraded operating system software version information and provides the aggregated information to all nodes in the viable quorum cluster when proposing a renewed membership in the viable quorum cluster and re-joining the viable quorum cluster after the leader node provides the aggregated information to all the nodes in the viable quorum cluster after the renewed membership in the viable quorum cluster has been proposed, wherein the renewed membership in the viable quorum cluster includes the node that previously withdrew from the viable quorum cluster and at least one other node, and the at least one other node formats a message consistent with the upgraded version of the operating system software at the node for transmission to the node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for establishing cluster membership of computer system nodes sharing read/write access to storage devices via a storage area network, the system comprising:
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a plurality of compute nodes, wherein the plurality of compute nodes form a viable quorum cluster; and a data communication network, wherein a node sends a withdrawal request to two or more other nodes in the viable quorum cluster when the node intends to withdraw from the viable quorum cluster to upgrade a version of an operating system software at the node, the withdrawal request sent through the data communication network, wherein; the withdrawal request is sent according to a rolling upgrade, the rolling upgrade performed such that at least one other node of the plurality of compute nodes in the viable quorum cluster can receive the upgraded version of the operating system software at a later point in time, the node withdraws from membership in the viable quorum cluster after sending the withdrawal request, the version of the operating system software program at the node is upgraded, a request for information is received from a leader node; information identifying the upgraded version of the operating system at the node is provided to the leader node, the leader node aggregates the upgraded operating system software version information and provides the aggregated information to all nodes in the viable quorum cluster when proposing a renewed membership in the viable quorum, the node re-joins the viable quorum cluster after the leader node aggregates the upgraded operating system software version information and provides the aggregated information to all nodes in the viable quorum cluster when proposing a renewed membership in the viable quorum, and the renewed membership in the viable quorum cluster includes the node that previously withdrew from the viable quorum cluster and at least one other node, and the at least one other node formats a message consistent with the upgraded version of the operating system software at the node for transmission to the node. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A non-transitory computer readable storage medium having embodied thereon a program for performing a method for establishing cluster membership of computer system nodes sharing read/write access to storage devices via a storage area network, the method comprising:
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sending a withdrawal request from a node in a viable quorum cluster to two or more other nodes in the viable quorum cluster when the node is scheduled to withdraw from the viable quorum cluster to upgrade a version of an operating system software at the node, wherein the withdrawal request is sent according to a rolling upgrade, the rolling upgrade performed such that at least one other node of the two or more other nodes in the viable quorum cluster can receive the upgraded version of the operating system software at a later point in time, and the node withdraws from membership in the viable quorum cluster after sending the withdrawal request; upgrading the version of an the version of the operating system software program at the node; receiving a request for information from a leader node; providing information identifying the upgraded version of the operating system software at the node to the leader node; and re-joining the viable quorum cluster after the leader node provides the aggregated information to all the nodes in the viable quorum cluster after the renewed membership in the viable quorum cluster has been proposed, wherein the rewnewed membership in the vialble quorum cluster includes the node that previously withdrew from the viable quorum cluster and at least one other node, and the at least one other node formats a message consistent with the upgraded version of the operating system software at the node for transmission to the node. - View Dependent Claims (18, 19, 20)
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Specification