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Published byKeven Hane
Modified over 4 years ago
Shiva Srivastava and Vaibhav Rastogi offend
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
Drives fail independently of each other Enables AFRs
Definition of failures Too coarse grained When do the disks get replaced Utilization Weekly averages Do not have anything better Same for temperature
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
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?
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?
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?
Slide 1 The basic problem Working Age t PDF f(t) Failures do not happen at fixed times. They occur randomly based on a distribution. Probabilty Density.
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