![]() ![]() It enables all SCSI commands to be passed directly to the guest OS, so the VM can effectively use several lower-level storage functions as required. This mode is appropriate for SAN-aware agents in the VM and provides minimal SCSI virtualization of the raw LUN. Here, the physical properties of the underlying storage unit or LUN is exposed to the guest OS within the VM. The physical compatibility mode is also known as pass-through RDM, or pRDM. The choice of mode depends on the features required within the specific environment. RDM offers physical and virtual compatibility modes. Thus, it no longer references the VMFS data store. The VM reads this ID to automatically send the data it reads and writes to the storage device. RDM contains the physical storage device's raw ID. Three options are provided - vDisk file on the VMFS data store, physical mode RDM and virtual mode RDM. This is suitable for VM clusters that need to access the same SCSI device in failover Identification data about each raw LUN, which is then resolved by the VMFS based on the current SCSI A physical mode for SAN-aware agents in the VM and a virtual mode for SAN snapshots and advanced file-locking operations. It acts as a proxy and consists of metadata to manage and redirect the VM to raw physical storage devices. ![]() The RDM file is created when vSphere administrators configure the VM's virtual disk to point directly to a LUN on a storage array. With RDM, any VM within the VM cluster can access the storage array, just like any other disk. RDM is a mapping file that resides in a separate VMFS volume that maps a LUN directly to a VM. Raw device mapping exploredĪpart from RDM, VMware servers can also use a Virtual Machine File System ( VMFS) to access storage. Because the VM can directly access the LUN, it helps improve disk access performance, particularly in I/O-intensive operations. Raw device mapping (RDM) enables disk access in a virtual machine ( VM) in the VMware server virtualization environment and allows a storage logical unit number (LUN) to be connected directly to a VM from the storage area network ( SAN). ![]()
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