Thomas Ruwart

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The Global File System (GFS) is a prototype design for a distributed file system in which cluster nodes physically share storage devices connected via a network like Fibre Channel. Networks and network attached storage devices have advanced to a level of performance and extensibility that the once believed disadvantages of “shared disk” architectures are no(More)
In this paper we present a new storage architecture for clusters that creates a shared memory of disk storage that is uniformly accessible to all cluster clients, scales to large capacity, and provides very high performance and connectivity. The cluster structure resembles a symmetric multiprocessor (SMP) in that clients (processors) can access disk data(More)
Advancements in storage technology along with the fast deployment of high-speed networks has allowed the storage, transmission and manipulation of multimedia information such as text, graphics, still images, video and audio to be feasible. Our study focused on the performance of the mass storage system for a large-scale video-on-demand server. Different(More)
In this paper we look at the performance characteristics of three tools used to move large data sets over dedicated long distance networking infrastructure. Although performance studies of wide area networks have been a frequent topic of interest, performance analyses have tended to focus on network latency characteristics and peak throughput using network(More)
Quality of Service (QoS) is crucial for certain applications such as multimedia. As the Object-based Storage Device (OSD) protocol emerges as the next generation storage technology, QoS provisioning for OSD-based systems has also received a great deal of attention. In this paper, we propose a QoS framework for OSD-based storage system that integrates both(More)
Obtaining consistent bandwidth with predictable latency from disk-based storage systems has proven difficult due to the storage system’s inability to understand Quality of Service (QoS) requirements. In this paper, we present a feasibility study of QoS with the Object-based Storage Device (OSD) specification. We look at OSD’s ability to provide QoS(More)
The bandwidth performance of a Fibre Channel Arbitrated Loop (FCAL) is roughly defined to be 100 MegaBytes (10 bytes) per second. Furthermore, FCAL is capable of a theoretical peak of 40,000 I/O operations (transactions) per second., These performance levels, however, are largely not realized by the applications that use Fibre Channel as an interface to(More)
Alex Elder, Thomas M. Ruwart, Benjamin D. Allen, Angela Bartow, Sarah E. Anderson, David H. Porter Laboratory for Computational Science and Engineering University of Minnesota Minneapolis, MN 55455 {elder,tmr,benjamin,bartow,sea,dhp} tel +1-612-626-0059 fax +1-612-626-0030 Abstract The InTENsity PowerWall is a display system used for(More)
With the growing popularity of storage area networks (SANs) and clustered, shared file systems, the file system is becoming a distinct and critical part of a system environment. Because the file system mitigates access to data on a mass storage subsystem, it has certain behavioral and functional characteristics that affect I/O performance from an(More)
Disk subsystems span the range of configuration complexity from single disk drives to large installations of disk arrays. They can be directly attached to individual computer systems or configured as larger, shared access Storage Area Networks (SANs). It is a significant task to evaluate the performance of these subsystems especially when considering the(More)