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Shiva Srivastava and Vaibhav Rastogi offend. Work conducted 5-10 years back Disk drives have changed All hard disks were Parallel ATA Prevalent technology.

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Presentation on theme: "Shiva Srivastava and Vaibhav Rastogi offend. Work conducted 5-10 years back Disk drives have changed All hard disks were Parallel ATA Prevalent technology."— Presentation transcript:

1 Shiva Srivastava and Vaibhav Rastogi offend

2 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 Drives fail independently of each other Enables AFRs

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

5 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 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 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 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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