Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

How VMHA works

Posted on 2014-03-30
6
Medium Priority
?
644 Views
Last Modified: 2014-04-03
**If I understand when you  enable HA in a cluster. HA elects a single host as a Master.
The Master monitors the state of other hosts  and Virtual Machines and communicates with vCenter.

Q: The master uses heartbeat to detect other hosts failure or isolation, what does it use t detect VM failure?

**The Master can detect if another host is failed or isolated using Heartbeats.
 isolation is determined if the Master is still able to receive heartbeat from the datastore to which the defunct  Host is not heartbeating back to the Master

Q: I wanted to make sure that the  Datastore really does heartbeat with the Master host.

Thank you
0
Comment
Question by:jskfan
  • 2
4 Comments
 
LVL 124

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 1440 total points
ID: 39964874
Q: The master uses heartbeat to detect other hosts failure or isolation, what does it use t detect VM failure?

There is also a HA Agent (FDM Agent) installed on each host, which also monitors the hosts, Master, Slave, and uses VMware Tools in the VM, to detect VM failure.

You will notice, that if a VM, is protected it will state HA Protected!

Q: I wanted to make sure that the  Datastore really does heartbeat with the Master host.

It's more complicated that just heartbeats, datastore, it uses the HA Agent (FDM Agent) on each host for communications. (Master and Slaves)

If you really want to know ALL the ins and outs in great details, Duncan Epping and Frank Denneman have now written three books on VMware HA and DRS Deepdive, which I recommend to ALL VMware Admins, and should be on your bookshelf!

Duncan's website is here, and is the most comprehensive VMware HA and DRS resource and explains all the basics, give it a read, and if you need to ask further questions please post back.

see here

http://www.yellow-bricks.com/vmware-high-availability-deepdiv/

I would recommend purchasing the HA DeepDive books!
0
 
LVL 13

Assisted Solution

by:Abhilash
Abhilash earned 560 total points
ID: 39964902
I second Andrew's comment. HA deepdive really gives you a clear picture of the HA concepts.
The book also comes with many live examples of what happens if a hardware failure happens etc.
Really worth buying.
0
 

Author Comment

by:jskfan
ID: 39972496
Ok…I just thought the pdf is available for everyone on Google.
0
 

Author Closing Comment

by:jskfan
ID: 39975572
Thank you Guys!
0

Featured Post

Nothing ever in the clear!

This technical paper will help you implement VMware’s VM encryption as well as implement Veeam encryption which together will achieve the nothing ever in the clear goal. If a bad guy steals VMs, backups or traffic they get nothing.

Question has a verified solution.

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

HOW TO: Install and Configure VMware vSphere Hypervisor 6.5 (ESXi 6.5), Step by Step Tutorial with screenshots. From Download, Checking Media, to Completed Installation.
August and September have been big months for VMware—from VMworld last month to our new Course of the Month in VMware Professional - Data Center Virtualization. We reached out to Andrew Hancock, resident VMware vExpert, to have a more in-depth discu…
Teach the user how to edit .vmx files to add advanced configuration options Open vSphere Web Client: Edit Settings for a VM: Choose VM Options -> Advanced: Add Configuration Parameters:
Teach the user how to configure vSphere Replication and how to protect and recover VMs Open vSphere Web Client: Verify vsphere Replication is enabled: Enable vSphere Replication for a virtual machine: Verify replicated VM is created: Recover replica…

877 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