---
title: "vprob.vmfs.extent.offline"
description: "Host has lost connection to a storage device that backs a VMFS datastore or a datastore extent. This event is logged when an host loses connection to storage."
canonical: "https://helpcenter.veeam.com/docs/mp/kb/h.vprob.vmfs.extent.offline.html"
breadcrumb: "Veeam MP for VMware Online Knowledge Base > Event-Based Rules > vSphere Host Storage Warning > vprob.vmfs.extent.offline"
dateModified: "2026-09-10"
---

# vprob.vmfs.extent.offline

## Summary

Host has lost connection to a storage device that backs a VMFS datastore or a datastore extent.

## Causes

This event is logged when an host loses connection to storage.

## Resolutions

Either a storage device that backs an entire datastore is offline, or one of the extents is offline. Virtual machines that use that storage may become unresponsive or fail.

Locate the device that has failed and restore connectivity. Check cabling and switch connections. Refer to this [VMware KB article](http://kb.vmware.com/kb/2008164) for further details.

## External

Refer to the [VMware Online Documentation](https://techdocs.broadcom.com/), especially the [vSphere Troubleshooting Guide](https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-DE119813-63A7-4B68-924D-1ED95F6EFFD7.html), for more information on vCenter event messages and possible solutions. .