I have a 3 disks file system configured in RAID1, created with Ubuntu
::
> Having not a spare disk, and being the file system
> a RAID1, I decided to use one of the 3 disks as target for the
> restore. I formatted it in EXT4 and tried the restore. The process
::
[liveuser@localhost ~]$ sudo btrfs fi show
warning, device 1 is missing
warning devid 1 not found already
Label: none uuid: 32eeac52-699b-4fa2-be61-06206910a37f
Total devices 3 FS bytes used 3.79TiB
devid 3 size 2.73TiB used 2.73TiB path /dev/sda
devid 4 size 2.73TiB used 2.73TiB path /dev/sdc2
*** Some devices missing
Btrfs v3.18.2
Looks like you didn't use btrfs device del to remove a disk, FS still
shows total devices as 3. presumably kernel knows about a device
missing. then , 'btrfs device del missing /mnt' will be the first step. IMO.
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