I was building a 2tb x 4 disks using mdadm. Originally mdstat said it was going to finish in 48 hours but unfortunately at 47 hours a power outage came into play :-)
So I decided to zero out the superblocks using mdadm and recreate the linux raid partitions to start clean from the beginning. To my surprise this time mdstat said it was only going to last 5 hours. I stopped the build a repeated the zerosuperblock/repartition process thinking I did something wrong but mdstat keeps saying it will only last 5 hours.
I don't understand what Is really happening, is mdadm resuming the Raid build process? Or somehow is re-using so something from he first build and that's why it is way faster? Is My Raid going to be fine?
I have been looking for an answer over the internet with no luck, any help/clarification will be appreciated Thanks!