![]() ![]() Well, RDM does not deliver you higher performance than a traditional VMFS, but it offloads CPU a bit. RDM merges some advantages of VMFS with direct access to the physical device. It keeps metadata for managing and redirecting disk access to the physical device. An RDM itself is a mapping file in a separate VMFS volume that acts as a proxy for raw physical storage. Raw device mapping (RDM) provides VMs with the direct access to the LUN. Let’s start with the basics: what RDM is and why to use it Well, apparently, this case is not unique, so I decided to share my experience in today’s article. Recently, I created vSphere VMs with such disks. To enable your VMs to talk directly to LUN, you need a raw device mapping file. ![]() Also, with direct access, physical-to-virtual conversion becomes possible without migrating a massive LUN to VMDK. ![]() Direct access comes in handy when you, let’s say, run SAN/NAS-aware applications on vSphere VMs, or if you’re going to deploy some hardware-specific SCSI commands. Sometimes, you need your VMs to access a LUN directly over iSCSI. ![]()
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