Recently I was compiling a new kernel and I noticed Raid-6 in the Raid section and wondered, “so what is raid-6 anyway?”  Actually, history may recall a slightly more R-rated exclamation, but that was the gist.  I was quite amused to find this in the help file.
WARNING: RAID-6 is currently highly experimental.  If you
use it, there is no guarantee whatsoever that it won’t
destroy your data, eat your disk drives, insult your mother,
or re-appoint George W. Bush.
Gotta love these Linux kernel comments and help messages.