The unix command to check for system disk space usage is df. There are a number of options that can be used with this command but we recommend using the df –h command
df -h
Depending on how your file systems are setup the most import area to check is the Live database area. In the scenario about the live database is held under /u/coins/live/data/db so the files system of main concern is /u
It is best practise not to have any file system about 80% utilised