How to kill your array - reboot your computer at a bad time. Who'd have thought raid1 could be so unreliable. https://btrfs.wiki.kernel.org/index.php/Gotchas#r

How to kill your array - reboot your computer at a bad time. Who'd have thought raid1 could be so unreliable. https://btrfs.wiki.kernel.org/index.php/Gotchas#raid1_volumes_only_mountable_once_RW_if_degraded https://btrfs.wiki.kernel.org/index.php/Gotchas#raid1_volume... I did end up having to copy the array out because of this. Copied it into a zfs array and am glad to be out of the land of gotchas.