Direct VM to SAN LUN Access with Raw Device Maps

How to provide Virtual Machines with direct access to shared SAN LUN storage | taught by Larry Karnis

Course description

Raw Device Maps
Virtual Machines have no direct ability to access Storage Area Network (SAN) Logical Unit Numbers (LUNs). So what do you do if you need to give a Virtual Machine direct ownership of a shared SAN LUN? You use a Raw Device Map (RDM). Raw Device Maps are implemented as virtual disks at the Virtual Machine level that proxy storage commands to a named Logical Unit Number (volume) on your SAN. With Raw Device Maps, you can take advantage of the benefits of SAN storage such as LUN Snapshotting (to implement SAN based LUN backup and recovery) or LUN Shadowing (to hot replicate LUNs to a corresponding LUN on your disaster recovery SAN). You can also benefit from your SAN's ability to dynamically grow LUNs (to easily manage low capacity situations).

In this course you will learn:

  • How to create a Raw Device Map virtual disk and how to hot-add the RDM to your Virtual Machine
  • Raw Device Map properties such as location, Shares and (most importantly) Type
  • About the two Types of Raw Device Maps: Physical RDMs and Virtual RDMs
  • How RDMS behave in cold migration, VMotion hot migration and Storage VMotion hot migration scenarios
  • How you can employ RDMs in Microsoft Fail Over Cluster scenarios to deliver high performance and very high availability to Microsoft Fail Over Cluster aware applications

By the end of this course you will understand how to make RDMs, the differences between Physical and Virtual RDMs, how RDMs respond to different migrations and how RDMs can be effectively employed to build 2-node, 4-node and 5-node Microsoft Fail Over Cluster configurations.

Larry Karnis
Larry Karnis
VMware Certified Professional - Author, Consultant, Lecturer

Get VMware vSphere & View Training... for less!

Q: What do you do if you need to learn VMware but can't afford the $4,000 - $6,000 charged for authorized VMware vSphere training? 

A: Enroll in my equivalent VMware vSphere 6.5 and Horizon View video-on-demand training... for less.

Many name is Larry Karnis - and I create courses that will help you start your career as a VMware vSphere 6.5 administrator, and help you build you knowledge and skill in vSphere 6.5 advanced features and capabilities. 

With Video-On-Demand training, I can provide more insight and detail, without the time constraints that a normal instructor led training class would impose. My goals are to:

  • Give you a better training experience than classroom training
  • Help you learn more than you can learn in a 5 day class
  • Give you the opportunity to learn at your own pace
  • Provide you to supporting books and hands-on lab rentals

At price points that you (or your boss) will appreciate.

Run This Class At Your Office

ESXLab maintains a pool of high-scoring, experienced instructors who would be glad to lead this event at your place of work. If you have 5 or more people and would like to run live instructor led (distance or on-site) training, please contact me for a quote.

About Me

I am an Information Technology consultant / trainer with over 30 years of experience in system administration, networking, security, infrastructure and security.

I worked for 10 years as a UNIX programmer / consultant before moving to Linux in 1995. I started working with VMware products in 2001 and decided to focus exclusively on VMware in 2004. I earned my first VMware Certified Professional (VCP) designation on ESX 2.0 in 2004 (VCP #: 993). I have also earned VCP in ESX 3, and in vSphere 4 and 5.

My VMware Work Experience

  • I have been providing VMware consulting and training for more than 14 years. I have lead literally hundreds of classes and taught thousands of people how to use VMware. I teach both introductory and advanced VMware classes.
  • I worked for VMware as a senior contract VMware Certified Instructor (VCI) and consultant for almost 5 years. One of my regular duties was to help mentor new VCI's - helping them prepare for and successfully deliver vSphere classes.
  • After leaving VMware, I launched my own training business focused on VMware virtualization in 2008. In 2013, VMware called me back to help them ramp up support services for the upcoming vSphere 5.1 product launch.
  • Prior to VMware, I worked as a contract consultant / trainer for RedHat (I hold RHCE, RHCI and RHCX), Global Knowledge, Learning Tree and many other training and consulting companies.

I hold a Bachelor of Science degree (majoring in Computer Science with a minor in Math) from the University of Toronto, Canada. 

I also hold numerous industry certifications including VMware Certified Professional on VMware Infrastructure 2 & 3 and vSphere 4 & 5 (ret.), VMware Certified Instructor (ret.), RedHat Certified Engineer (RHCE), RedHat Certified Instructor (RHCI) and RedHat Certified Examiner (RHCX) as well as certifications from LPI, HP, SCO and others.

I hope to see you in one of my VMware classes very soon... If you have questions, please contact me directly.

And... please link to me on LinkedIn -



Larry Karnis

For more information or for questions about this course, please contact:

Larry Karnis
President, ESXLab

+1 (905) 451-9488 x100
Mobile+1 (416) 890-8191
ESXLab VMware vSphere and View Training

Course Curriculum

Direct VM to SAN LUN Access with Raw Device Maps
Direct VM to SAN LUN Access with Raw Device Maps FREE TRIAL
Raw Device Maps - Overview FREE TRIAL
Specifying a Raw Device Map FREE TRIAL
Raw Device Map Properties
Raw Device Map Compatibility Modes
Physical Raw Device Maps And VMotion
Physical Raw Device Maps And Storage VMotion
Physical Raw Device Maps And Cold Migration
Virtual Raw Device Maps And VMotion
Virtual Raw Device Maps And Storage VMotion
Virtual Raw Device Maps And Cold Migration
Raw Device Maps and Microsoft Fail Over Clusters
2-Node Active / Standby Clusters
2-Node Active / Standby Cluster Across ESXi Hosts
2-Node Active / Standby Physical and Virtual Cluster
4-Node Fail Over Clusters
5-Node Fail Over Clusters
Raw Device Maps Lab FREE TRIAL
Raw Device Maps - Review And Questions FREE TRIAL
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