• After upgrading from ESXi 4.x to 5.x, the Summary tab of the host reports the warning
• You see the warning:
  
  System logging not Configured on host <hostname>

1. Navigate to Configuration > Software > Advanced Settings > Syslog > Global.
2. Set the type of the Syslog.global.logDir parameter to []/scratch/log. In this case, the logs reside on the local disk.
   
   Note: If you want to send the logs to a different datastore, set the type of the Syslog.global.logDir parameter to the complete path where you want to store the log files. For example, [Datastore1]/logs. The location of the datastore should be unique to each ESXi host.
   
   Do not specify the same log directory to multiple hosts, doing so may result in a crash or kernel panic.

For information on recommended disk space, see the Providing Sufficient Space for System Logging section of vSphere Installation and Setup Guide.