I'm hovering around 94% disk utilization on my ESGs. I've tried re-deploying them, with hopes that it would clear up, but no such luck.
Connect to the ESX using ssh.
Check /var/log/messages (All logs are stored there, and by default are rotated after 2 mb and 5 files are kept= check the amount of files and sizes (maybe somethig is wrong there)
Also list the partitions and try to find where the space is being consumed to start troubleshooting