ESXI – Failed – Cannot Change the Host Configuration

Issue:

We had set up and configured a new Netapp AFF 400. When we tried to add the datastores to ESXi 7.0 host we go the following error:


Error Message:

Key : haTask-ha-host-vim.host.DatastoreSystem.createVmfsDatastore-1660216443

Description : Creates a new VMFS datastore State

Failed – Cannot change the host configuration.

Errors: Failed to update disk partitions for /vmfs/devices/disks/naa.600a09803831462f715d52596146475

Resolution:

I have actually seen this before. The problem is an MTU issue. In our case the VPC in the network didnt have the correct MTU so once fixed that worked. If you see this error then you might want to check the MTU throughout your infrastructure (eg DVS, VMKernels etc)