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Failure trends in a Large Disk Drive Population

Shiva Srivastava and Vaibhav Rastogi offend. Failure trends in a Large Disk Drive Population. Relevance. Work conducted 5-10 years back Disk drives have changed All hard disks were Parallel ATA Prevalent technology today is SATA Some aspects not covered Power cycles. Assumptions.

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Failure trends in a Large Disk Drive Population

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  1. Shiva Srivastava and VaibhavRastogi offend Failure trends in a Large Disk Drive Population

  2. Relevance • Work conducted 5-10 years back • Disk drives have changed • All hard disks were Parallel ATA • Prevalent technology today is SATA • Some aspects not covered • Power cycles

  3. Assumptions • Drives fail independently of each other • Enables AFRs

  4. Coarse measurements • Definition of failures • Too coarse grained • When do the disks get replaced • Utilization • Weekly averages • Do not have anything better • Same for temperature

  5. Statistical correctness • What was the size of the fleet? • How does it compare with others • Patterns like those in Figure 3 may be random • Difference between 2 and 4 % is not much

  6. Usefulness • No good empirical model • Perhaps the measurements are too coarse • How am I supposed to use them? • Can they be different for different data centers, for different usage patterns?

  7. Improper presentation • Where is the control in Figure 8 and 11? • Why do the confidence levels decrease so much in Figure 11 • Shows there is a lot of variance? Why?

  8. Comparison with others • Your finding not corroborating manufacturers’ findings • Does it not go against you? • People have used large number of disks • How do you compare with them?

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