Which do you believe?

  • Costly FC and SCSI drives are more reliable than cheap SATA drives.
  • RAID 5 is safe because the odds of two drives failing in the same RAID set are so low.
  • After infant mortality, drives are highly reliable until they reach the end of their useful life.
  • Vendor MTBF are a useful yardstick for comparing drives.

According to papers from Google and CMU at FAST ‘07, none of these are backed by empirical evidence. StorageMojo has a good summary of the key points

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