![]() The VMkernal only sends READ and WRITE to the mapped device.Īs we explore the use cases for RDM storage below, the differences between these modes and when you should use them will become clearer. The “real” hardware characteristics are abstracted from the VM. Virtual Mode: The mapped device is fully virtualized.Physical Mode: TheESXi hypervisor VMkernel passes all SCSI commands from the VM through to the physical SAN LUN, except for the “REPORT LUNs” command.Two Modes of RDM Storageīefore discussing the use cases for RDM, there are two distinct modes of RDM supported by vSphere, which have some common characteristics and significant differences. The “proxy file” points to a raw physical Storage Area Network (SAN) Logical Unit Number (LUN) storage device. vmdk extension but is a “proxy” file containing only mapping information. These files are stored on VMware Datastores - storage of various supported types such as SAN or NFS volumes - that are presented to the ESXi hosts and formatted using the VMFS filesystem. This storage consists of virtual disk or “VMDK” (or “.vmdk”) files. Typically, VMs use storage that the VMware ESXi host virtualizes. To help you understand the pros and cons of VMware RDM, in this article, we’ll take a closer look at what it is, how it works, and popular use cases. However, there are some disadvantages too, and it is not an ideal choice for all VMware environments. ![]() There are a variety of scenarios where using RDM devices is advantageous or even required. Many of these raw SCSI features are not available with virtual disk files (VMDKs). VMware Raw Device Mapping (RDM) is a method of presenting storage to a virtual machine (VM) in VMware vSphere that enables many features of raw Small Computer Systems Interface (SCSI) devices. ![]()
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