Why use rdm vsphere 5

To map a virtual disk for a VM, you need to create a datastore and add it for the VM. On the vSphere Client, perform the following steps to create a datastore:. Figure Creating a datastore. Figure Specifying the datastore type. Figure Specifying the datastore name and selecting the LUN. Figure Selecting the file system version.

Generally, use maximum available space. Below table provides some of the important 11 differences between RDM virtual and physical compatibility mode. I hope this article helps you to understand the some of the key difference between virtual and physical compatibility RDM disks. Raw device mapping RDM is method to provide direct access to a LUN on a iscsi or fibre channel storage system for a virtual machine. Virtual Machine can directly access the storage device using RDM and RDM contains metadata which controls the disk access to the physical device.

Use cases for Raw Device Mapping 1. Thanks for your help :. That's a great question. However the answer lies in my earlier response. Yes vmdk is a descriptor and flat-vmdk is the data file, but the descriptor defines the data file size which cannot be more than 2 TB if VMkernel has to read it. Hope that helps. That does help, and indeed, makes good sense. Thank you for explaining!