Sometimes I got this warning
What it can be and what should I do?
What version of vCenter are you on and is it Windows or Appliance ?
Facing same problem. We are using appliance v6.0.0 (3634794).
Any ideas?
Did you try this KB?
/storage/log directory is full in vCenter Server Appliance 6.0 (2143565) | VMware KB
It fixed the problem in my case.