On Sun, 2 Feb 2020 13:45:58 +0100 Skibbi <skibbi@xxxxxxxxx> wrote: > root@rpi4b:~# dmesg |grep btrfs > [223167.290255] BTRFS: error (device dm-0) in > btrfs_run_delayed_refs:2935: errno=-5 IO failure > [223167.389690] BTRFS: error (device dm-0) in > btrfs_run_delayed_refs:2935: errno=-5 IO failure > root@rpi4b:~# dmesg |grep BTRFS Try without that grep, and see if anything else happened to cause these errors. ... > [203285.469285] BTRFS info (device sda1): read error corrected: ino 0 > off 32759808 (dev /dev/sda1 sector 80368) > [203285.469515] BTRFS info (device sda1): read error corrected: ino 0 > off 32763904 (dev /dev/sda1 sector 80376) > [204448.566295] BTRFS: device label NAS devid 1 transid 5 /dev/dm-0 Such as here, doesn't this look like the device may have disconnected and reappeared (to make btrfs show the "device" message). -- With respect, Roman
