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03-30-12, 08:50 PM
http://1.gravatar.com/avatar/918b62f6df5271a4fbe2da71d14bea9c?s=110&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a 11cd5ca435acc9bb6523536%3Fs%3D110&r=G (http://www.whamcloud.com/2012/03/lustre-parallel-directory-operations-coming-in-lustre-2-2/)Lustre 2.2 is out today, and Whamcloudâ??s Bryon Neitzel writes (http://www.whamcloud.com/2012/03/lustre-parallel-directory-operations-coming-in-lustre-2-2/) that itâ??s new Lustre Parallel Directory does a lot to improve performance.

Until now in Lustre, filename lookup and file system modifying operations (such as create and unlink) were protected by a single lock for an entire directory, thus limiting file writes to the directory to serialized access. Whamcloud has eliminated this bottleneck by introducing a parallel locking mechanism for the entire directory. This capability, called parallel directory operations (PDO), enables multiple metadata service threads to concurrently perform lookup, create, and unlink operations on a single directory. Multiple Object Indexes (MOIs) have also been implemented with PDO. These allow parallel lookups of a files inode from the File Identifier (FID), which is how a client identifies a unique file in the Lustre file system.

Read the Full Story (http://www.whamcloud.com/2012/03/lustre-parallel-directory-operations-coming-in-lustre-2-2/) or Download the 2.2 release (http://www.whamcloud.com/downloads). In related news, the Lustre community will meet in Austin on April 23-25 for LUG 2012 (http://www.opensfs.org/lug/program).

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