![]() This will vary depending on the type of SAN in use (consult the SAN vendors documentation on how to do this).Ģ. The first step to adding a RDM to a virtual machine is to assign an unused LUN to your ESXi Servers. This allows it to leverage SAN specific features such as interation with the SANs own snapshot functions.ġ. Physical compatability mode allows the VM to pass SCSI commands direct to the storage system LUN.Virtual compatability mode provides vSphere snapshots of this virtual disk.LUNs presented from FC, FCoE and iSCSI are supported for RDMs. If using Microsoft Cluster Services (MSCS), Failover Clusters or other clustering solution.To utilize native SAN tools and commands. ![]() The main reason for using an RDM should be as follows: I've seen lots of vSphere environments that have gone over kill on RDMs for SQL servers and the like for "performance reasons", its difficult to manage! If your looking for improved storage performance look into the VMware Paravirtual SCSI (PVSCSI) adaptor. There is a mis-understanding that RDMs offer greater performance compared to VMDK's on a VMFS datastore. The reasons for doing this should purley be for functional and management reasons, NOT performance. Rather than creating a virtual disk (VMDK) on a LUN, which is generally shared with other VMs and virtual disks. Creating/Adding a Raw Device Mapping (RDM) to a Virtual MachineĪ Raw Disk Mapping (RDM) can be used to present a LUN directly to a virtual machine from a SAN.
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