ESXi 5.0 DRS is not working and is enabled...

Posted on 2012-08-26
Medium Priority
Last Modified: 2012-08-26
Hi all,

I have a 2 hosts ESXi 5 cluster, and DRS is enabled and set to fully automate but it is not kicking in.  For now I have manually balanced out the guests per hosts in this cluster.  Any ideas what/where I can check to get this working?  Logs, settings etc.?  It has never worked since this is a new cluster as well.  I've also manually clicked on, "Run DRS" button in the DRS tab and nothing happens.
Question by:tlouly
LVL 33

Accepted Solution

Busbar earned 1000 total points
ID: 38334642
drs will kick in when there is a load or resource contention not seeing it means that there is no resource contention.

you will see the VMotion events in the events kicked also see this post http://communities.vmware.com/message/1086559#1086559

Author Comment

ID: 38334701
quick question that came up though.  if all VMs are residing from an initial hosts and are all online, then I added the 2nd host into the cluster, wouldn't DRS see a off balance of resources or would the VMs need to be rebooted to see both hosts in the DRS setup for it to balance automatically?
LVL 124
ID: 38334791
After a period of time, DRS may optimize and balance the resources between hosts. Depening upon how agreesive the "slider" you have set.

If you were to Power Off and Power On the VM, it's likely it would be Registered on the new unloaded host.

If you experiment, and really load one of your hosts, by creating many 4GB VMs, and power them on ALL at once, you will start to see vMotion events, as Hosts are migrated to your new hosts.

There is another way to test DRS, and that is to create an Anti-Affinity Rule to keep to Virtual Machines apart, this will force, DRS, to keep machines apart on each host!

Just check you have vMotion enabled on each host, shared storage, networking setup correctly on each host.

I can recommend the following books

VMware vSphere 4.1 HA and DRS Technical deepdive (Volume 1)

By Duncan Epping and Frank Denneman


ISBN-10: 1456301446
ISBN-13: 978-1456301446

Written by Duncan Epping and Frank Denneman, both of whom are Consulting Architects at VMware and are perceived by the industry as Subject Matter experts on VMware High
Availability and VMware Distributed Resource Scheduler.

This book zooms in on two key components of every VMware based infrastructure. It covers the basic steps needed to create a VMware HA and DRS cluster, and goes on to explain the concepts and mechanisms behind HA and DRS which will enable you to make well educated decisions. You will get the tools to understand and implement e.g. HA admission control policies, DRS resource pools and resource allocation settings and more.

On Amazon US



on Amazon UK



Available in Europe from

Duncan and Frank have also released a book for vSphere 5.0 Clustering (HA and DRS) as well.

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article outlines why you need to choose a backup solution that protects your entire environment – including your VMware ESXi and Microsoft Hyper-V virtualization hosts – not just your virtual machines.
It’s time for spooky stories and consuming way too much sugar, including the many treats we’ve whipped for you in the world of tech. Check it out!
Teach the user how to configure vSphere clusters to support the VMware FT feature Open vSphere Web Client: Verify vSphere HA is enabled: Verify netowrking for vMotion and FT Logging is in place or create it: Turn On FT for a virtual machine: Verify …
Teach the user how to install and configure the vCenter Orchestrator virtual appliance Open vSphere Web Client: Deploy vCenter Orchestrator virtual appliance OVA file: Verify vCenter Orchestrator virtual appliance boots successfully: Connect to the …
Suggested Courses

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question