Disk partition / has only 0% free

Hello cathy.

Linux FileSystem is separated in partitions

Filesystem      Size Used Avail Use% Mounted on
/dev/mapper/vg--db--sda-set.3.root -> 427M 427M   0 100% /
/dev/mapper/vg--db--sda-set.3._config -> 3.2G 120M 2.9G  4% /config
/dev/mapper/vg--db--sda-set.3._usr -> 4.0G 3.4G 407M 90% /usr
/dev/mapper/vg--db--sda-set.3._var -> 3.0G 866M 2.0G 31% /var
/dev/mapper/vg--db--sda-dat.share -> 40G 8.0G  30G 22% /shared
/dev/mapper/vg--db--sda-dat.log -> 20G 1.1G  18G  6% /var/log

This means that locations like /config, /shared or /var have a separated partition and they are managed separately. So, If you remove some file from /shared, you are only freeing space on /shared partition.

In the other hand, other locations without specific partition risede in root (/). For example /home or /root reside in root partition (/). So, as JG says, try to dig into these locations first.

KR,

Dario.