Managing workflow communication in a distributed storage system
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United States of America Patent
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Jan 3, 2012
Grant Date -
Aug 26, 2010
app pub date -
Mar 11, 2009
filing date -
Feb 23, 2009
priority date (Note) -
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Abstract
In a data storage system having a plurality of storage nodes storing replicas of stripes, one storage node serves as a primary stripe node for a stripe. Client applications using the data storage system request operations affecting metadata stored in the stripe, and the data storage system creates workflow objects to implement the requested operation. Once the operation is completed, the workflow is acknowledged. A method for establishing a new primary stripe node comprises performing, by a selected storage node, a feasibility determination to determine the feasibility of the selected storage node becoming the new primary stripe node. It is feasible to become a new primary stripe node when doing so does not cause workflows that have been acknowledged, or that will be acknowledged, to result in strays.
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