If you see this error when running esxcli command


Error interacting with configuration file /etc/vmware/lunTimestamps.log: Timeout while waiting for lock, /etc/vmware/lunTimestamps.log.LOCK, to be released. Another process has kept this file locked for more than 30 seconds. The process currently holding the lock is smartd(PID). This is likely a temporary condition. Please try your operation again

ESXi host showing as Disconnected in vCenter Server is a known issue in ESXi 6.0. 


his is a known issue affecting ESXi 6.0.  

Currently, there is no resolution.


To work around this issue, disable smartd daemon on the host.


To disable smartd daemon:


  1. Connect to the affected ESXi host with an SSH session.
  2. Run this command to stop the smartd service:

    /etc/init.d/smartd stop

  3. Run this command to stop the smartd service from starting on reboot:

    chkconfig smartd off