This document discusses storage options in OpenStack and highlights distributed storage using GlusterFS. It provides an overview of prominent storage uses today in OpenStack like Swift and Cinder. Emerging uses under development include Manila for shared file systems, Savanna for Hadoop integration, and Disaster Recovery as a Service. The document then contrasts distributed and centralized storage, listing advantages of software-defined distributed storage using GlusterFS. It outlines GlusterFS architecture including concepts like bricks, volumes, replication and geo-replication. Finally, it details integrating GlusterFS with various OpenStack services like Glance, Cinder, Swift and benefits like performance, scalability and availability.