The 750,000 hours is regarding the array or drive ...  Must be an array [IMAGE] ..
Hello All ,              Need some quick help please , heres what I need to know ,  - Life expectancy of a HDD (FC/SSD) - any refrences will be appreciated . - How do I calculate the failure rate of a disk with respect to the array .  I've read the Information Storage Management book and here's what it says .  "Consider a storage array of 100 drives , each with an average expectancy of 750,000 hours . The average life expectancy of this collection in the array , therefore is 750,000/100 = 7500 hours . This means that a disk drive in this array is likely to fail atleast once in 7500 hours .  Source - Information Storage Management by Wiley  In the statement above it says each drive has an  avg expectancy of 750,000 hours ??? really ?[IMAGE] which is approx 30k days thats way too much , can someone please explain this to me ...   I just want to calculate the disk failure rate for our clariions !!!
HDD life expectancy with respect to the Clariion array