On Mon, Nov 23, 2015 at 07:07:51PM +0100, David Sterba wrote:
> > Also, it calls raid5/6 "copies" rather than "parity". Perhaps add
> > another column for parity, change the redundancy column to copies, and
> > adjust accordingly? Alternatively, keep the single redundancy column and
> > just change raid5 to 1 parity and raid6 to 2 parity.
>
> Yeah, parity would be better. I'll split it to copy and parity, where a
> copy really means 1:1 byte copy.
Copy from manual page rendering:
┌────────┬────────────────────────────────────┬─────────────────┐
│ │ │ │
│Profile │ Redundancy │ Min/max devices │
│ ├──────────────┬────────┬────────────┤ │
│ │ │ │ │ │
│ │ Copies │ Parity │ Striping │ │
├────────┼──────────────┼────────┼────────────┼─────────────────┤
│ │ │ │ │ │
│single │ 1 │ │ │ 1/any │
├────────┼──────────────┼────────┼────────────┼─────────────────┤
│ │ │ │ │ │
│ DUP │ 2 / 1 device │ │ │ 1/1 (see note) │
├────────┼──────────────┼────────┼────────────┼─────────────────┤
│ │ │ │ │ │
│ RAID0 │ │ │ 1 to N │ 2/any │
├────────┼──────────────┼────────┼────────────┼─────────────────┤
│ │ │ │ │ │
│ RAID1 │ 2 │ │ │ 2/any │
├────────┼──────────────┼────────┼────────────┼─────────────────┤
│ │ │ │ │ │
│RAID10 │ 2 │ │ 1 to N │ 4/any │
├────────┼──────────────┼────────┼────────────┼─────────────────┤
│ │ │ │ │ │
│ RAID5 │ 1 │ 1 │ 2 to N - 1 │ 2/any │
├────────┼──────────────┼────────┼────────────┼─────────────────┤
│ │ │ │ │ │
│ RAID6 │ 1 │ 2 │ 3 to N - 2 │ 3/any │
└────────┴──────────────┴────────┴────────────┴─────────────────┘
https://github.com/kdave/btrfs-progs/blob/devel/Documentation/mkfs.btrfs.asciidoc#profiles
(ignore the alignment and other formatting artifacts, it looks better in
the manual page or html)
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