Missing volume after power failure

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F_L_ wrote:

Then I get:

 

root@Ultra:/# mount --bind / /mnt
root@Ultra:/# du -h --max-depth=1 /mnt
1.8G    /mnt/data

There's your issue... /mnt/data should be empty.

Do you have replicate jobs running? It's common that it pushes data to /data even though the data volume is not mounted, filling up the OS volume.

Then, once the data volume is mounted on /data, you can no longer see what was in the folder itself but the OS volume is still full.

As you have temporarily mounted the OS volume back to /mnt, you should check what's in /mnt/data and clear it to free up space on your OS volume. WARNING: Be careful what you're doing, you want to clear /mnt/data, NOT /data (where your actual data volume is mounted)!