slides.02242011 - Storage: Scaling Out > Scaling Up?...

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Storage: Scaling Out > Scaling Up? Ankit Singla Chi-Yao Hong
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How Can Great Firms Fail? C. M. Christensen
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Sustain vs. Disrupt Sustaining technologies Customer demand driven Pioneered by incumbent big firms Disruptive technologies Often convince people: “You want this!” Create new markets, new customers Often pioneered by new firms Lower On Tech Bigger On Opportunity 3
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Sustain vs. Disrupt Performance Tim e High- end Demand Low-end Demand S u s t a i n g T e c h D r p 4
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A Case for Redundant Arrays of Inexpensive Disks (RAID) David Patterson, Garth Gibson and Randy Katz
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Why RAID? Performance of SLEDs has increased slowly Amdahl’s law and the I/O crisis ; 100x faster CPU, 10% I/O time, S? Large memories / SSDs as buffers don’t work Transaction processing 6
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Inexpensive Disks Lower cost, lower performance Better price/MB, smaller size, power footprint Also, lower reliability for same capacity  Add Redundancy! 7
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RAID 1 Idea: Just mirror each disk Better throughput for reads Huge MTTF Inefficient / costly 8
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RAID 2 Hamming codes for error detection/correction So use 3 parity disks with 4 data disks P1 P2 D1 P3 D2 D3 D4 P1 X X X X P2 X X X X P3 X X X X 9
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slides.02242011 - Storage: Scaling Out > Scaling Up?...

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