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

Posted on 2012-08-26
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

    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

    Author Comment

    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 116

    Expert Comment

    by:Andrew Hancock (VMware vExpert / EE MVE)
    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.

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