ESXi troubleshooting tip: to help troubleshoot SIOC issues here’s how to enable logs for troubleshooting

In order to ascertain root cause of IO control issues always good to get digging into the logs, by default not enabled so will need to carry out the following steps – applicable to esxi 5.x/6.x

To enable SIOC logging from the vSphere client:

  1. Logon to your vSphere client.
  2. Click on Host | Configuration tab.
  3. From the left-hand side column named Software, then Advanced Settings. The Advanced Settings pop-up will appear.
  4. In the parameters list, go down to the Misc section and select the Misc.SIOControlLogLevel parameter.
  5. By default, it is set to zero, which means it is disabled. To log everything, set the value to 7.
  6. Enter 7 in the field and click OK to close the pop-up box.
  7. You will now be able to see the logs in /var/log/vmkernel.
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