The subject is drifting a bit but I'm going with the flow here: Seth Mos <seth.mos@dds.nl> writes:
Raid10 is the only valid raid format these days. With the disks as big as they get these days it's possible for silent corruption.
How do you detect it? A man with two watches is never sure what time it is. Unless you have a filesystem that detects and corrects silent corruption, you're still hosed, you just don't know it yet. RAID10 between the disks in and of itself doesn't help.
And with 4TB+ disks that is a real thing. Raid 6 is ok, if you accept rebuilds that take a week, literally. Although the rebuild rate on our 11 disk raid 6 SSD array (2TB) is less then a day.
I did a rebuild on a RAIDZ2 vdev recently (made out of 4tb WD reds). It took nowhere near a day let alone a week. Theoretically takes 8-11 hours if the vdev is completely full, proportionately less if it's not, and I was at about 2/3 in use. -r