HPCwire: SDSC, UCSD, LBNL Team Wins SC09 'Storage Challenge' Award

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November 20, 2009

SDSC, UCSD, LBNL Team Wins SC09 'Storage Challenge' Award

by Jan Zverina

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Team highlights flash-memory of SDSC's new "Dash" and "Gordon" systems

Nov. 20 -- A research team from the San Diego Supercomputer Center (SDSC) at UC San Diego and the University of California's Lawrence Berkeley National Laboratory has won the Storage Challenge competition at SC09, the leading international conference on high-performance computing, networking, storage and analysis being held in this week in Portland, Ore.

The research team based its Storage Challenge submission for the annual conference based on the architecture of SDSC's recently announced Dash high-performance compute system, a "super-sized" version of flash memory-based devices such as laptops, digital cameras and thumb drives that also employs vSMP Foundation software from ScaleMP, Inc. to provide virtual symmetric multiprocessing capabilities.

Dash is the prototype for a much larger flash-memory HPC system called Gordon, which is scheduled to go online in mid-2011 after SDSC was awarded a five-year, $20 million grant from the National Science Foundation (NSF) this summer to build and operate the powerful system. Both Dash and Gordon are designed to accelerate investigation of a wide range of data-intensive science problems by providing cost-effective data performance more than 10 times faster than most other HPC systems in use today.

The hypothesis of the team's Challenge, called "Data Intensive Science: Solving Scientific Unknowns by Solving Storage Problems," was that solid state drives (SSDs) based on NAND (Not AND) flash technology are "ready for prime time" in that that they are reliable and cheap enough to improve input/output density (I/O rate) by more than 10 times, or greater than one order of magnitude.

"The current data storage I/O rate is far lower than the ever-increasing rate of enthusiasm among researchers and scientists, who are now drowning in a sea of data because of this differential," said SDSC's Arun Jagatheesan, team leader for this year's competition. "With the SC09 Storage Challenge, our team demonstrated the prototype of a data-intensive supercomputer that can bridge this gap. Our mission in this challenge was to design, build, deploy and commission a prototype of such a supercomputer at challenging construction and operational costs, without compromising the data-intensive performance of the scientific applications."

"A major challenge for the scientific user community is to deal with storage latency issues in our systems," said SDSC interim director Mike Norman, who is also the principal investigator for the center's upcoming Gordon supercomputer. "Even though not all scientific problems are data-intensive, many of them are, and this challenge illustrated that we can overcome latency issues with innovative approaches and partnerships. We're looking forward to helping the NSF and others meet the needs of this new generation of data-intensive science."

"Moving a physical disk-head to accomplish random I/O is so last-century," said Allan Snavely, associate director of SDSC, co-principal investigator for SDSC's Gordon system and project leader for Dash. "Indeed, Charles Babbage designed a computer based on moving mechanical parts almost two centuries ago. With respect to I/O, it's time to stop trying to move protons and just move electrons. With the aid of flash SSDs, we can do latency-bound file reads more than 10 times faster and more efficiently than anything being done today."

The Storage Challenge team considered several ideas, which in the process resulted in making changes to the traditional storage architecture, including both hardware and software, to achieve its goal. The changes included incorporating a large (750 GB) RAMFS (random-access memory file system) with 1 TB (terabyte) of flash SSD file system to dramatically accelerate scientific database searches such as those used in the Palomar Transient Factory database, a fully automated, wide-field survey aimed at a systematic exploration of the optical transient sky using a new 8.1 square degree camera installed on the 48-inch Samuel Oschin telescope at the Palomar Observatory in southern California.

"In the SC09 Storage Challenge, we presented the architecture of our Dash prototype and the excellent results we have already obtained," noted Jagatheesan. "We believe our approach provides cost-effective data performance, and we hope that other academic and non-academic datacenters throughout the HPC community can benefit from our approach and experiences.

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