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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:TALK19996@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-performance\,
  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 reque
 sts\, so that we can overlap disk seeks with rotational delays\, and (ii) 
 decoupling the multiplicity of the components within each of these two ele
 ctro-mechanical systems to further enhance parallelism.\n\nI will first pr
 ovide a historical retrospective on intra-disk parallelism\, discussing th
 e similarities and key differences between our approach and the multi-actu
 ator drives of the past. I will present an overview of the design space of
  intra-disk parallelism\, identifying the locations within a disk drive wh
 ere parallelism can be incorporated. Using a set of commercial workloads\,
  I will provide an analysis of the performance and power characteristics o
 f a specific design within this space and show that storage arrays built u
 sing such drives consume 40%-60% less power while delivering performance t
 hat is comparable to arrays built using conventional disk drives. Finally\
 , I will discuss the key engineering and cost issues involved in building 
 intra-disk parallel drives and show that intra-disk parallelism can be a p
 ractical approach to build energy-efficient enterprise storage systems.\n
LOCATION:SS03 of the Computer Lab
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