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Troubleshooting RDM LUN creation

If you experience errors creating RDM LUNs, you should be aware of some of the common errors and workarounds.

Error message

Failed to create disk in virtual machine, Failed to Map virtual disk: File [datastore] path_name.vmdk was not found.

Problem

You might encounter this error when you attempt to create an RDM LUN with ESX Software Initiator on a VM with the VM name greater than 33 characters.

You have several options to work around this issue.

Workaround 1

Manually create the same directory inside the datastore.

Workaround 2

Rather than selecting your datastore with the Store with Virtual machine option, select the datastore in which you intend to create the RDM LUN. When you create your RDM LUN, use the same datastore you just selected.

Workaround 3

Configure SnapDrive VirtualCenter or ESX Server login settings with the VirtualCenter credentials.