Presenting a Raw Device Mapping (RDM) device to multiple hosts to allow VM to vMotion and HA failover

Products

• VMware vSphere ESXi

Issue/Introduction

An RDM is presented to a virtual machine registered on a host and needs to be available from other hosts so the VM may migrate or HA failover.

Environment

ESXi - all versions

Resolution

• Ensure the storage is accessible from all required hosts.
• Ensure the same LUN ID is presented to all hosts.
• Ensure the VM configuration directory, including the vmdk mapping file to the RDM, is on a datastore accessible by all hosts.
• You can now migrate the VM between hosts.

Additional Information

See the documentation on adding an RDM to a VM