+ <para>An extended attribute that describes the default stripe pattern
+ for new files created within that directory. This is also inherited by
+ new subdirectories at the time they are created.</para>
+ </glossdef>
+ </glossentry>
+ <glossentry xml:id="DNE">
+ <glossterm>Distributed namespace (DNE)</glossterm>
+ <glossdef>
+ <para>A collection of metadata targets serving a single file
+ system namespace. Without DNE, Lustre file systems are limited to a
+ single metadata target for the entire name space. Without the ability
+ to distribute metadata load over multiple targets, Lustre file system
+ performance may be limited. The DNE functionality has two types of
+ scalability. <emphasis>Remote Directories</emphasis> (DNE1) allows
+ sub-directories to be serviced by an independent MDT(s), increasing
+ aggregate metadata capacity and performance for independent sub-trees
+ of the filesystem. This also allows performance isolation of workloads
+ running in a specific sub-directory on one MDT from workloads on other
+ MDTs. In Lustre 2.8 and later <emphasis>Striped Directories</emphasis>
+ (DNE2) allows a single directory to be serviced by multiple MDTs.
+ </para>