---
title: "com.vmware.vc.sioc.NotSupportedHostConnectedToDatastoreEvent"
description: "SIOC has detected that a host connected to a SIOC-enabled datastore is running an older version of ESX that does not support SIOC. The datastore is connected to ESX/ESXi hosts whose version is earlier than 4.1."
canonical: "https://helpcenter.veeam.com/docs/mp/kb/com.vmware.vc.sioc.notsupportedhostconnectedtodatastoreevent.html"
breadcrumb: "Veeam MP for VMware Online Knowledge Base > vCenter Server Alarms > Veeam VMware: Pre-4.1 host connected to SIOC-enabled datastore Alarm > com.vmware.vc.sioc.NotSupportedHostConnectedToDatastoreEvent"
dateModified: "2026-09-10"
---

# com.vmware.vc.sioc.NotSupportedHostConnectedToDatastoreEvent

## Summary

SIOC has detected that a host connected to a SIOC-enabled datastore is running an older version of ESX that does not support SIOC.

## Causes

The datastore is connected to ESX/ESXi hosts whose version is earlier than 4.1. According to VMware limitations, ESX/ESXi hosts earlier than 4.1 do not support SIOC.

## Resolution

Upgrade hosts to a later version or disconnect the datastore from ESX/ESXi hosts whose version is earlier than 4.1.

## External

Refer to [VMware Online Documentation](https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-DE119813-63A7-4B68-924D-1ED95F6EFFD7.html) and this [VMware KB article](https://techdocs.broadcom.com/us/en/vmware-cis/vsphere/vsphere/7-0/vsphere-resource-management-7-0/managing-storage-i-o-resources/storage-io-control-requirements.html) for more information on SIOC restrictions.