355 research outputs found
Swift: Using Distributed Disk Striping to Provide High I/O Data Rates
No full textWe present an I/O architecture, called Swift, that addresses the problem of data rate mismatches between the requirements of an application, storage devices, and the interconnection medium. The goal of Swift is to support high data rates in general purpose distributed systems.
Swift uses a high-speed interconnection medium to provide high data rate transfers by using multiple slower storage devices in parallel. It scales well when using multiple storage devices and interconnections, and can use any appropriate storage technology, including high-performance devices such as disk arrays. To address the problem of partial failures, Swift stores data redundantly.
Using the UNIX operating system, we have constructed a simplified prototype of the Swift architecture. The prototype provides data rates that are significantly faster than access to the local SCSI disk, limited by the capacity of a single Ethernet segment, or in the case of multiple Ethernet segments by the ability of the client to drive them.
We have constructed a simulation model to demonstrate how the Swift architecture can exploit advances in processor, communication and storage technology. We consider the effects of processor speed, interconnection capacity, and multiple storage agents on the utilization of the components and the data rate of the system. We show that the data rates scale well in the number of storage devices, and that by replacing the most highly stressed components by more powerful ones the data rates of the entire system increase significantly
Abstract Adding Adaptive Flow Control to Swift/RAID
No full textWe discuss an adaptive flow control mechanism for the Swift/RAID distributed file system. Our goal is to achieve nearoptimal performance on heterogeneous networks where available load capacity varies due to other network traffic. The original Swift/RAID prototype used synchronous communication, achieving throughput considerably less than available network capacity. We designed and implemented an adaptive flow control mechanism that provides greatly improved performance. Our design uses a simple automatic repeat request (ARQ) go back N protocol coupled with the congestion avoidance and control mechanism developed for the Transmission Control Protocol (TCP). The Swift/RAID implementation contains a transfer plan executor to isolate all of the communications code from the rest of Swift. The adaptive flow control design was implemented entirely in this module. Results from experimental data show the adaptive design achieving an increase in throughput for reads from 671 KB/s for the original synchronous implementation to 927 KB/s (a 38 % increase) for the adaptive prototype, and an increase from 375 KB/s to 559 KB/s (a 49 % increase) in write throughput.
Coos River Basin fish management plan
No full textprepared by Linda J. Wagoner, Kim K. Jones, Reese E. Bender, Jerry A. Butler, Darrell E. Demory, Thomas F. Gaumer, Joel A. Hurtado, William G. Mullarkey, Paul E. Reimers, Neil T. Richmond, Thomas J. Rumreich.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references (pages 122-124).Mode of access: Internet from the Oregon Government Publications Collection.Text in English
\u3ci\u3eThe Adventures of Darrell and the Invincible Man\u3c/i\u3e
No full textThe Adventures of Darrell and the Invincible Man has been nominated for the prestigious National Association of Multicultural Education Outstanding Multicultural Children\u27s Book Award.
Research literature is replete with studies that demonstrate how and why Black children when asked to draw themselves do so almost exclusively by depicting themselves as White. Researchers have concluded that this predilection is the result of the Black child being acculturated in a White racist society. This book explores identity development in minority, particularly Black, youth. This book provides a riveting deconstruction of how minority children adopt the White, western ideal as their self-image and the proper way to make the children themselves aware of their subconscious adoption and how the astute multicultural educator, parents, and anyone interested in identity development in minority, particularly, black youth, can redirect this propensity.
Dr. Omowale Akintunde has published a plethora of research regarding multicultural education, black identity development, white privilege, and how these dynamics impact and influence early childhood education. He is also the author of Multiculturalism and the Teacher Education Experience: Essays on Race, Class, and Culture (iUniverse, 2007). He has served on the Editorial Board of the Official Journal of the National Association of Multicultural Education and is currently serving on the national executive board of the National Association of Multicultural Education (NAME) and the National Board of Peace Education (NAPE). The Adventures of Darrell and the Invincible Man is certain to become a necessary and celebrated addition to the field of multicultural children\u27s literature.https://digitalcommons.unomaha.edu/facultybooks/1045/thumbnail.jp
Reflection Roundtable: White Supremacy in Oregon History
No full textOregon Historical Society Panel Discussion with Dr. Karen Gibson, Dr. Darrell Millner, Dr. Carmen Thompson, and Justice Adrienne Nelson, Moderator. Reflection on Hatfield Lecture by Henry Louis Gates, Jr. October 29, 2020. This panel reflects upon the Oregon Historical Society event two days prior, the second virtual Hatfield Lecture Series talk held October 27 that featured the one and only Henry Louis Gates, Jr., host of Finding Your Roots and author of a number of books including his latest work, Stony the Road: Reconstruction, White Supremacy, and the Rise of Jim Crow
Word and Work Session 82
No full textIn Word and Work: An Intersection, Concordia Seminary, St. Louis, President Emeritus Dr. Dale A. Meyer talks with Dr. Darrell Zimmerman, executive director of Grace Place Wellness, about the ins and outs of ministry. Zimmerman is the author of Reclaiming the Joy of Ministry. “There’s this tremendous irony of [pastors] proclaiming the grace of Christ and His undeserved love and favor that is for all people and then being very critical toward themselves,” Zimmerman says. Some pastors are “great dispensers of grace but not so good at being receivers of grace.” In the book, Zimmerman guides readers through a detailed analysis of the hazards of ministry life and helps them discover new possibilities for a long, joyful and fruitful career in ministry. Learn more about the book at Reclaiming the Joy of Ministry. In the audio version, listen to an online presentation by Zimmerman. Learn more at Concordia Theologyhttps://scholar.csl.edu/wordandwork/1091/thumbnail.jp
Syllabi for statics courses
No full textResearch Initiation Grant: Problem/Project-Based Learning in Statics, a Stepping Stone to Engineering Education Research.The two syllabi included in this document were used during statics courses that were taught as part of a research study on the effect on student outcomes of introducing projects to a traditional lecture course.While projects appear to have much to offer engineering education, rigorous evaluations of the impact of projects on student outcomes are rare. The objective of the project is to study the incorporation of three group design projects into a sophomore level statics course and to measure the effect of the changes on student outcomes including content knowledge and various affective outcomes.National Science Foundation Grant No. 1137023
Project assignments for statics
No full textResearch Initiation Grant: Problem/Project-Based Learning in Statics, a Stepping Stone to Engineering Education Research.The project assignments included in this document were used in addition to a traditional lecture based statics course in our research. However, these assignments can be adapted to fit a variety of course styles. We provide additional details of our course here to give an example implementation and context for some of the assignment requirements.While projects appear to have much to offer engineering education, rigorous evaluations of the impact of projects on student outcomes are rare. The objective of the project is to study the incorporation of three group design projects into a sophomore level statics course and to measure the effect of the changes on student outcomes including content knowledge and various affective outcomes.National Science Foundation Grant No. 1137023
Statics survey
No full textResearch Initiation Grant: Problem/Project-Based Learning in Statics, a Stepping Stone to Engineering Education Research.While projects appear to have much to offer engineering education, rigorous evaluations of the impact of projects on student outcomes are rare. The objective of the project is to study the incorporation of three group design projects into a sophomore level statics course and to measure the effect of the changes on student outcomes including content knowledge and various affective outcomes.National Science Foundation Grant No. 1137023
Exploiting multiple I/O streams to provide high datarates
No full textWe present an I/O architecture, called Swift, that addresses the problem of data-rate mismatches between the requirements of an application, the maximum data-rate of the storage devices, and the data-rate of the interconnection medium. The goal of Swift is to support integrated continuous multimedia in general purpose distributed systems. In installations with a high-speed interconnection medium, Swift will provide high data-rate transfers by using multiple slower storage devices in parallel. The data-rates obtained with this approach scale well when using multiple storage devices and multiple interconnections. Swift has the
exibility to use any appropriate storage technology, including disk arrays. The ability to adapt to technological advances will allow Swift to provide for ever increasing I/O demands. To address the problem of partial failures, Swift stores data redundantly. Using the Unix operating system, we have constructed a simplied prototype of the Swift architecture. Using a single Ethernet-based local-area network and three servers, the prototype provides data-rates that are almost three times as fast as access to the local SCSI disk in the case of writes. When compared with NFS, the Swift prototype provides double the data-rate for reads and eight times the data-rate for writes. The data-rate of our prototype scales almost linearly in the number of servers and the number of network segments. Its performance is shown to be limited by the speed of the Ethernet-based local-area network. We also constructed a simulation model to show how the Swift architecture can exploit storage, communication, and processor advances, and to locate the components that will limit I/O performance. In a simulated gigabit/second token ring local-area network the data-rates are seen to scale proportionally to the size of the transfer unit and to the number of storage agents
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