Urgh. I had a RAID 6 reshape on my NAS that was projected to take 28 days to complete, I kid you not. It was stuck at an abysmal 4MB/s transfer rate. Here's how to unblock it. First, follow [all the advice on general raid speedups](https://www.cyberciti.biz/tips/linux-raid-increase-resync-rebuild-speed.html) -- assuming md2 is your RAID device and you need to replace sd[DEVICE] below with the correct block devices that constitute the array: >