Search the VMware Knowledge Base (KB)
View by Article ID

Multipath Configuration for MSCS with N+1 Configuration (1004440)

  • 8 Ratings


There are multiple paths to the shared LUNs on the physical host.


No multi-pathing software can be running in the physical machine or the virtual machine. The ESX host automatically uses native ESX multi-pathing. For active/passive arrays, both hosts can be connected to only a single storage processor, and there can be only a single path from the physical machine hosting the native node to the array.

When configuring Microsoft Clustering, both nodes in the cluster must see the same views of the storage. RDMs must be presented to the virtual machine in physical compatibility mode. If the RDM were presented to the virtual machine in virtual compatibility mode, ESX introduces a virtual layer and the virtual machine would view the disk differently than the disk presented to the physical machine. This would cause an issue with Microsoft Clustering. The virtual machine must therefore see the RDM as a physical disk with a single path to the storage.

If you enable MPIO software in the virtual machine, it changes the view of the disk on the physical host. As a result, you have a configuration where the virtual machine and the physical host have different views of the storage.

To ensure that the virtual machine and the physical host have the same view of the storage, you must:

  • Present the RDM in physical compatibility mode to the virtual machine
  • Not use multipathing software in the physical Windows host

Request a Product Feature

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.


  • 8 Ratings

Did this article help you?
This article resolved my issue.
This article did not resolve my issue.
This article helped but additional information was required to resolve my issue.

What can we do to improve this information? (4000 or fewer characters)

Please enter the Captcha code before clicking Submit.
  • 8 Ratings