Log error: Unmanaged I/O workload detected

If you see the following error in your vSphere hosts’ log files

Unmanaged I/O workload detected on shared datastore running Storage I/O Control (SIOC) for congestion management

please consult https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1020651 . From this page, “It is triggered when Storage I/O Control (SIOC) detects that a workload that is not managed by SIOC is contributing to I/O congestion on a datastore that is managed by SIOC.”

If you do not use SIOC, are positive that there is no misconfiguration or unwanted activity and that your storage is in rude health, and you wish to turn off the logging of this event:

  1. Log into the vSphere web client.
  2. Browse to the datastore.
  3. Right-click on the datastore and choose Configure Storage I/O Control.
  4. Disable the statistics collection.
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