NAS refuses to start up.
Icon has exclamation and triangle. Hover shows I/O error.
Examine /var/log/syslog, search “Error IO”.
Apr 3 16:21:14 hvX kernel: [4948799.898572] device-mapper: thin: 253:4: switching pool to out-of-data-space (queue IO) mode Apr 3 16:21:15 hvX lvm[469]: WARNING: Thin pool pve-data-tpool data is now 100.00% full. Apr 3 16:22:15 hvX kernel: [4948861.095596] device-mapper: thin: 253:4: switching pool to out-of-data-space (error IO) mode
The local-lvm disk is full. Make some space. This is how:
In my case I deleted a VM. For some reason on this disk, the default size was 60 GB instead of the usual 100 GB.