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I issued the btrfs replace command, but got the message, that the > target HD is mounted (it was not, it did not appear in the mount output). > > 2. I did a system reboot in hope to do a successfull replace. The system > did not start but said, that it could not mount the btrfs fs because of > a missing device. > > 3. I booted GParted Live to investigate further. > > 3.1 A mount -o degraded,rescue=usebackuproot,ro failed. > In dmesg I get the following errors > > flagging fs with big metadata feature > allowing degraded mounts > trying to use backup root at mount time > disk space caching is enabled > has skinny extents > bdev /dev/sda errs: wr 755, rd 0, flush 0, corrupt 0, gen 0 > bdev /dev/sdd1 errs: wr 7601141, rd  3801840, flush 12, corrupt 3755, > gen 245 > replace devid present without n active replace item It appears that replace-device already got the superblock but failed to update metadata which is good. Could you try physically removing the replace-target device and reboot and mount -o degraded. And most importantly, before reusing this replace-target device again, please run a wipefs -a. If there is a matching fsid and devid=0, it gets scanned into the kernel, which makes it appear to have mounted. HTH Thanks, Anand > failed to init dev_replace -117 > open_ctree failed > > 4. btrfs check runs through without error > > -> I guess even if i was prompted the message, that the target device of > the btrfs replace was mounted the replace was started. Due to the reboot > now there seems to be errors in the filesystem additional to an replace > which i cannot stop, because i can't mount the filesystem. > > Right now I have a btrfs check --check-data-csum running in hope to get > the errors fixed. > > But actionally I really don't know how to deal with that situation. > > Do you have any recommondations? > > > Thank you very much! > Samuel > > > Additional info: > > I'm on an recent debian bullseye. But I can't run uname -r because right > now I'm on the GParted (1.4.0-5) Live-System. > > btrfs fi show /dev/sdd1 > Label: 'Data' uuid: >     Total devices 4 FS bytes used 6.59 TiB >     devid 1 size 3.65 TiB used 3.39 TiB path /dev/sdd1 >     devid 2 size 2.73 TiB used 2.49 TiB path /dev/sdb1 >     devid 3 size 5.46 TiB used 2.11 TiB path /dev/sdc1 >     devid 1 size 5.46 TiB used 5.21 TiB path /dev/sdd1