In VMware vSphere, RDMs are sometimes a necessary evil despite their feature limiting nature. So I’ve created a list of resources to VMware docs and KB articles for some of the more common questions, issues, etc. There are numerous articles on RDMs, this is just a small subset.
- Migrating virtual machines with Raw Device Mappings (RDMs) (1005241)
- Difference between Physical compatibility RDMs and Virtual compatibility RDMs (2009226)
- Expanding the size of a Raw Device Mapping (RDM) (1007021)
- Cannot vMotion virtual machines with physical mode RDM (2084419)
- Moving an existing RDM to a different virtual machine (2107923)
- Attaching an RDM with snapshots to a virtual machine (1018457)
- Creation of New RDM for MSCS Cluster Node when Cluster Service Is Active on Another Node (1862)
- Unable to add a physical mode disk mapping (RDM) to a virtual machine stored on an NFS datastore (1001856)
- Hard disk / RDM removal from a powered on virtual machine (1004910)
- Adding an RDM LUN to the second node in the MSCS cluster fails with the error: Incompatible device backing specified for device ‘0’ (2054897)
- Microsoft Windows Server Failover Clustering on VMware vSphere 6.x: Guidelines for supported configurations (2147661)
- Using SQL Server Failover Clustering on a vSphere 6.7 vSAN Datastore with vSAN iSCSI Target Service: Guidelines for supported configurations (54461)
- Migrating virtual machines with Raw Device Mappings (RDMs) (1005241)
- Switching a raw data mapping between physical and virtual compatibility modes in ESX/ESXi (1006599)