LSI 9271-8i array reconstruction

I'm in process of converting/expanding 8x4tb raid 5 array to 14x4tb raid 6 array, and thought it may be helpful to others to know times and impact on performance.

Equipment:
LSI 9271-8i raid controller
HGST 724040AL 4tb sata hdd (qty14)
RES2CV360 sas expander
Intel 520 4x240gb ssd cachecade

Workload:
medium/light - home/lab nas, streaming media
current array has 21tb data, 18% free space

Progress:
4 days 15 hrs 80%
5 days 18 hrs 20 min 100%

ETA:
1 day 5 hrs
expansion complete
(changes to...

LSI 9271-8i array reconstruction