Failure Trends in a Large Disk Drive Population

Failure Trends in a Large Disk Drive Population
Google’s Disk Failure Experience


Failure Trends in a Large Disk Drive Population

Google’s Disk Failure Experience


...The observed range of AFRs (see Figure 2) varies from 1.7%, for drives that were in their first year of operation, to over 8.6%, observed in the 3-year old pop
Figure 2: Annualized failure rates broken down by age groups ulation.
The higher baseline AFR for 3 and 4 year old drives is more strongly influenced by the underlying reliability of the particular models in that vintage than by disk drive aging effects. I
t is interesting to note that our 3-month, 6-months and 1-year data points do seem to indicate a noticeable influence of infant mortality phenomena, with 1-year AFR dropping significantly from the AFR observed in the first three months...
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