Would it be best to raid 1 two drives each and LVM them together?
My next question would be about how to do this as I have never done a linux software raid.
I would do it this way if they are not system disks:
Eg: sdc + sdd = md0 (raid 1) sde + sdf = md1 (raid 1) md0 + md1 = md2 (raid 0)
Use md2 as a physical volume