HA Simulator : What will happen to your VM.

Hello All,

I was answering some Question in the Vmware Communities and Found an interesting question. “What if host failed having  HA configured with 33% Admission Control.

Answer Anyone??


I believe everyone will answer the best of their experience, But what if we can also test out the environment and HA Failure As well and see the impact and result sametime. Isnt it awesome ? Yes !!!

How can it possible ? 

You all knows about the different vmware log files. I believe DRMDUMP too.

DRMDUMP : This log file been generated once your HA configures and updates once any changes made. Which includes Actions proposed and taken by VMware Distributed Resource Scheduler (DRS), grouped by the DRS-enabled cluster managed by vCenter Server. These logs are compressed.

Location :You can find these dumps in your vcenter under ” c:\documents and settings\all users\application data\vmware\vmware virtualcentre\logs\drmdump”

What To Do now :

Step 1 : Open the http://hasimulator.vmware.com/

Step 2: Click on “Simulate Now”  Button.


Step 3 : Next screen will ask you to upload the DRS Dump file (aka Drmdump) Located on “c:\documents and settings\all users\application data\vmware\vmware virtualcentre\logs\drmdump” folder in your vcenter Server.


Step 4: As soon you upload the file you will get the option to simulate the option by “specific host failure” &  “Worst case single host failure” and click on simulate button.


it will take less than 1 minute to get the result generated . you can see the result like below for your HA and DRS configuration is successfully designed or not.


In Result you can see the total vms  , VM count which will fail to restart , vms with reduce resources and the vm count which will not be impacted. And cluster overview in a single page.

Benefits : i believe this is the awesome simulator which can help any virtualization administrator, Datacenter Designer or Expert for view their configuration and design to secure its own environment way in best possible way.

Thanks for reading this.

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