Fully formatting about 6 x Seagate 4TB drives, it's been 9 hours and counting, just letting people know that it can take forever, but I do see the light at the end of the road, should be done soon.
I was wondering if it was necessary to have all identical hard drives for a RAIDZ2 set up, I've read that it was necessary for a RAID 6 set up but can't find any info on if it was necessary for RAIDZ2.