Fast I/O failure detection and cluster wide failover
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United States of America Patent
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Mar 25, 2014
Grant Date -
Apr 4, 2013
app pub date -
Sep 30, 2011
filing date -
Sep 30, 2011
priority date (Note) -
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Abstract
A method for fast I/O path failure detection and cluster wide failover. The method includes accessing a distributed computer system having a cluster including a plurality of nodes, and experiencing an I/O path failure for a storage device. An I/O failure message is generated in response to the I/O path failure. A cluster wide I/O failure message broadcast to the plurality of nodes that designates a faulted controller. Upon receiving I/O failure responses from the plurality of nodes, an I/O queue message is broadcast to the nodes to cause the nodes to queue I/O through the faulted controller and switch to an alternate controller. Upon receiving I/O queue responses from the plurality of nodes, an I/O failover commit message is broadcast to the nodes to cause the nodes to commit to a failover and un-queue their I/O.
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