On 22.04.20 12:44, Hugo Mills wrote:
You can't set up btrfs RAID-1 to use only one device. It's only
possible to end up like that if you set up a 2-device RAID-1 and then
unplug a device and mount it in degraded mode.
It was this sentence in the btrfs wiki, what confused me, also comments
in the net that btrfs is not giving you RAID with redundant data
(https://btrfs.wiki.kernel.org/index.php/FAQ):
"It is possible with all of the descriptions below, to construct a
RAID-1 array from two or more devices, and have those devices live on
the same physical drive. This configuration does not offer any form of
redundancy for your data."
