~$ sudo apt-get

When you have to deal with system that lacks lsof and cannot be easily installed, you can run the following to show information regarding currently open file handlers.

ls -l `ls -l /proc/*/fd/ 2>/dev/null | grep ">" | cut -d ">" -f 2 | grep "/" | sort | uniq`

If the culprit of disk space usage has already been deleted, you’ll find the following in your output.

ls: /var/log/openvswitch/ovs-vswitchd.log.1: No such file or directory
ls: (deleted): No such file or directory

———

Teran came up with the following.

for file in `ls -l /proc/*/fd/* | grep deleted | awk '{print $9}'`; do echo -n "$file "; ls -l $file | awk '{print $11}' | tr -d '\n'; stat -L $file | grep Size; done

If you see
Network Error: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilder
when attempting to connect to an XVP console, update your SSL crt/key, restart (apache|nginx) and stunnel.

More information can be found here.
XVP troubleshooting guide