But sometimes it doesn't work out like it should. The ip and sudoers manpages are notorious disasters. (At one point I remember reading an in-depth writeup about what went wrong with the creation of iproute2, but I can't find it now. If anyone else has the link, please send it to me!)
Despite some gripes I have with the command interface - the primary operations are too dangerous, so there should be no short options - mdadm has a decent manpage. But today I came across an insane, inscrutable gem:
These same layouts are available for RAID6. There are also 4 layouts that will provide an intermediate stage for converting between RAID5 and RAID6. These provide a layout which is identical to the corresponding RAID5 layout on the first N-1 devices, and has the 'Q' syndrome (the second 'parity' block used by RAID6) on the last device. These layouts are: left-symmetric-6, right-symmetric-6, left-asymmetric-6, right-asymmetric-6, and parity-first-6.
What is the "Q" syndrome?? What does it all mean?? Google came up empty. The world may never know.