"MTTF is the measure of the probability of how long it will take a hard disk drive to fail. But it's not a very useful metric. Let's say a typical enterprise hard disk drive MTTF is 2.5 million hours. Which means it may take 2.5 million hours until a drive fails. But 2.5 million hours, if you do the math, is 285 years."
"This MTTF of 2.5 million hours can be calculated into an annualised failure rate, and this annualised failure rate for enterprise drives is 0.35%. This is a more useful value because it means that 0.35% of the HDDs you are running may fail within a year. Let's say you have a datacentre with 1,000 drives. [That means] 0.35% or 3.5 drives per year may fail. That would be within the reliability specification."
Mean Time To Failure (MTTF) is defined as the probability measure of how long a hard disk drive will take to fail, but it is commonly misinterpreted. A typical enterprise HDD MTTF of 2.5 million hours converts to an Annualised Failure Rate (AFR) of approximately 0.35%. AFR indicates that 0.35% of drives may fail per year, so a datacentre with 1,000 drives should expect roughly three to four failures annually. These reliability figures assume operation within specified conditions: continuous 24x7 use, average temperature below 42°C, workload under 550 TB per year, and within a five-year warranty.
Read at ComputerWeekly.com
Unable to calculate read time
Collection
[
|
...
]