Ken Lutz

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Editor's Note: This draft of the paper has been submitted to a conference. As we will revise the paper, please beware this is a working document and the information content will change. Given that you have requested a copy of this draft, we would be delighted to get your reactions and comments on how to improve the paper. (In fact, by asking for his early(More)
—We develop a flexible and responsive electrical load in the form of domestic refrigerators augmented with a thermal storage system, a wireless sensor network for monitoring and actuation, and a controller that enables response to external controls. Using this, we investigate the potential of such loads for two applications: price-responsive demand and(More)
In 1989, the RAID (Redundant Arrays of Inexpensive Disks) group at U. C. Berkeley built a prototype disk array called RAID-I. The bandwidth delivered to clients by RAID-I was severely limited by the memory system bandwidth of the disk array' s host workstation. We designed our second prototype, RAID-H, to deliver more of the disk array bandwidth to file(More)
RAID-II is a high-bandwidth, network-attached storage server designed and implemented at the University of California at Berkeley. In this paper, we measure the performance of RAID-II and evaluate various architectural decisions made during the design process. We first measure the end-to-end performance of the system to be approximately 20 MB/s for both(More)
The United States electricity grid faces significant problems resulting from fundamental design principles that limit its ability to handle the key energy challenges of the 21 st century. We propose an innovative electric power architecture, rooted in lessons learned from the Internet and microgrids, which addresses these problems while interfacing(More)
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We describe the implementation of a large scale disk array controller and subsystem incorporating over 100 high performance 3.5" disk drives. It is designed to provide 40 MB/s sustained performance and 40 GB capacity in three 19" racks. The array controller forms an integral part of a file server that attaches to a Gb/s local area network. The controller(More)
We have shown a prototype user interface for the InfoPad, a portable terminal with multi-modal input and multimedia output. We believe that many of the people who could benefit from inexpensive, portable, networked terminals are not computer experts, and we are therefore designing the InfoPad and its user interface to be more like a notebook than a(More)
The InfoPad project explores the infrastructure and devices required for portable wireless access to the national information infrastructure. The InfoPad model emphasizes high-bandwidth wireless connectivity and moves the computing power of the portable device into the backbone network, where we can provide not only full internet access, but increased(More)
&OVER THE PAST decade, we have witnessed far-reaching changes in the IT field. Semiconductor sales for consumer and communication devices now surpass those for traditional computation. The IT infrastructure is moving away from the desktop and laptop model to centralized servers, communicating with ubiquitously distributed (and often mobile) access devices.(More)