Differences between Virtual and Physical RDM

In this article, We are going to discuss the overview of Raw Device Mapping and difference between RDM virtual and Physical compatibility mode.

Raw device mapping (RDM) is providing direct access to a LUN on an ISCSi or fibre channel storage system for a virtual machine. The VM can directly access the storage device using RDM and the RDM contains metadata which controls the disk access to the physical device. For more information about RDM, take a look at VMware’s official Documentation.

Types of RDM Compatibility Mode

  1. Virtual compatibility mode allows an RDM to act exactly like a virtual disk file, including the use of snapshots.
  2. Physical compatibility mode allows direct access of the SCSI device for those applications that need lower level control.

Differences between Physical and Virtual RDM Modes

Lots of people wonder what is the differences between both types of Raw Device Mapping and when to use either of them. Below table provides some of the main differences between RDM virtual and physical compatibility mode.

An RDM provides a number of benefits, but it should not be used in every situation as there are lots of limitations that needs to be considered when it comes to daily operational tasks.

Published by Mohamed Atef Ibrahim

I have started my journey in the Information Technology field as a System Engineer in 2017 and instantly fell in love with virtualization. Currently, I am focusing on VMware Software Defined Datacenter Portfolio, Cloud & Hyper-converged infrastructure solutions.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

Create your website with WordPress.com
Get started
%d bloggers like this: