@RedTechEngineer@graf@splitshockvirus so RAID 2 was designed back in the 50s and 60s when computers and hard drives were very different and a single hard drive weighed 80 kg for like 5 MB.
Computers were designed very differently back then. However it was very complex and expensive to implement so it rarely ever got used. However RAID 3 wasn't nearly as complex and tedious. It has shortcomings compared to RAID 4 and RAID 5 tho.
I'm kind of surprised there is no RAID 7 since some RAID card manufacturers have their own version of it plus ZFS essentially has it.
I'm still waiting for ZFS to allow you to change raidz level.