Hello,
I have two identical HDDs formated in btrsf with RAID 1. One is mounted at /mnt, the other at /mnt/two. Such config worked fine for over two months.
Today I had to take router cover off (https://forum.test.turris.cz/t/led-separation-component-to-improve-clarity-of-light/1795?u=etua) during whole process I did not touch wires connected to the hard drives. Later I noticed that my SMB server does not work properly. Only one HDD was mounted, here is what I saw during my investigation:
root@turris:~# lsblk -o name,uuid,mountpoint,size
NAME UUID MOUNTPOINT SIZE
sda 6c4cb5f4-ea0f-4fe1-8697-9a7da5844720 /mnt/two 2.7T
sdb 6c4cb5f4-ea0f-4fe1-8697-9a7da5844720 2.7T
mtdblock0 1M
mtdblock1 7M
mmcblk0 7.3G
`-mmcblk0p1 1bc620c8-724d-4bcb-8224-2a48b3a309cf / 7.3G
mmcblk0boot0 4M
mmcblk0boot1 4M
mmcblk0rpmb 4M
Notice how sda and sdb have the same UUID and there is no other HDD of their size elsewhere. How is that possible? I use current stable release.