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Old 03-30-12, 08:50 PM   #1
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Post Lustre 2.2 Released Today with New Parallel Directory

Lustre 2.2 is out today, and Whamcloud's Bryon Neitzel writes that it'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 or Download the 2.2 release. In related news, the Lustre community will meet in Austin on April 23-25 for LUG 2012.

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