Non-VI workload detected on the datastore.
A datastore is managed by SIOC. The SIOC has detected that an external party is contributing to I/O congestion on a datastore. The external workload may be caused by a third-party backup solution accessing a VM snapshot on the datastore, system operations performed by the storage array or incorrect datastore configuration.
Check if non-VI workload can be avoided, so that SIOC can properly and most effectively allocate storage traffic between virtual machines.
Refer to this VMware KB article for more information about supported datastore configuration.