Allowing nodes to run with a full root partition could lead to system stability issues.
This issue is often temporary and can be caused by system files that are eventually deleted automatically. This event also commonly occurs when a file is mistakenly written into the root partition by an administrator working in the node console.
Follow the instructions in article 89552 on the EMC Online Support site.
If the event persists, gather logs, and then contact EMC Isilon Technical Support for additional troubleshooting. For instructions, see Gathering cluster logs.