- Dec 21, 2010
Starting a thread to discuss bugs in the RAID mean time till data loss (MTTDL) calculator on ServeTheHome. We do need help testing so any assistance is greatly appreciated.
Poisson distribution. Updated for MTTDL model that should be more clear next week.Is MTTDL assumed to be a normal distribution (i.e. bell curve)? Looking at the numbers, "mean" to me means I have a 50% chance of data loss after X years, depending on the parameters I input. What I'd be interested in is the standard deviation, and also higher "confidence" tiers.
In other words, 50/50 odds doesn't mean much to me. I'd like to know, how many years (or months or days) do I have e.g. 75%, 90% and 99% chance of no data loss.