Clustered and highly-available wide-area write-through file system cache
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United States of America Patent
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Jul 7, 2015
Grant Date -
Oct 23, 2014
app pub date -
Apr 17, 2013
filing date -
Apr 17, 2013
priority date (Note) -
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Abstract
A method for accessing data stored in a distributed caching storage system containing a home cluster and a secondary cluster is provided. A first copy of a file is stored on the home cluster and a second copy of the file is stored on the secondary cluster. The second copy of the file is associated with an inode data structure having a consistency attribute. An input/output request is received directed to the file and indicates that file is in an inconsistent state by updating the inode's consistency attribute. The first copy and the second copy of the file is updated according to the received input/output request and it is determined whether the first copy and the second copy were updated successfully. The maintaining of the inode's consistency attribute is indicative of the inconsistent state of the file.
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