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SUMMARY:Intra-Disk Parallelism: A Green Storage Solution for Data Centers 
 - Sudhanva Gurumurthi\, Assistant Professor in the Computer Science Depart
 ment at the University of Virginia
DTSTART:20090922T130000Z
DTEND:20090922T140000Z
UID:TALK20128@talks.cam.ac.uk
CONTACT:Anthony Hylick
DESCRIPTION:Server storage systems are often built using a large number of
  disks to meet the performance and capacity demands of data-intensive appl
 ications. However\, such large storage systems can consume a significant a
 mount of power\, thereby increasing the power and cooling costs of a data 
 center. In this talk\, I will present a novel disk drive design\, called 
 “intra-disk parallelism”\, which can facilitate building high-performa
 nce\, low-power enterprise storage systems. Intra-disk parallelism extends
  the conventional hard disk drive architecture by: (i) decoupling the way 
 that the spindle and arm-assembly of a disk drive are used to service I/O 
 requests\, so that we can overlap disk seeks with rotational delays\, and 
 (ii) decoupling the multiplicity of the components within each of these tw
 o electro-mechanical systems to further enhance parallelism.\n\nI will fir
 st provide a historical retrospective on intra-disk parallelism\, discussi
 ng the similarities and key differences between our approach and the multi
 -actuator drives of the past. I will present an overview of the design spa
 ce of intra-disk parallelism\, identifying the locations within a disk dri
 ve where parallelism can be incorporated. Using a set of commercial worklo
 ads\, I will provide an analysis of the performance and power characterist
 ics of a specific design within this space and show that storage arrays bu
 ilt using such drives consume 40%-60% less power while delivering performa
 nce that is comparable to arrays built using conventional disk drives. Fin
 ally\, I will discuss the key engineering and cost issues involved in buil
 ding intra-disk parallel drives and show that intra-disk parallelism can b
 e a practical approach to build energy-efficient enterprise storage system
 s.\n
LOCATION:SS03\, William Gates Building
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