We clustered the 2 ESX nodes. What I'd like (don't
know if it's possible): if a node fails, the VM is
automatically moved over to the other node in the
state it is in.
My understanding:
1.) VMotion will move a VM over in the state it was
in, but it's manual.
If a host fails, VMotion will not be able to move the guest really since it is powered off at the time of the failure. VMotion is for moving guests from host to host as live servers. Correct in that it is manual.
2.) DRS will move VMs over in the state they were
in.
See #1, DRS is basically automated VMotion with logic behind it. It decides that Host A is overutilized while Host B is underused so it will move any VMs configured to move from A -> B
3.) If a node fails, HA will move the VM over.
However, it in doing so the VM will be rebooted.
Yes, you need to keep in mind that if a host becomes unavailable it would no longer be running the VMs (unless there is a lapse in heartbeat communications but that's another complete discussion). That VM could be automatically restarted on another member of the HA Cluster.
Is this correct?
Also, I'm running into a warning regarding possible
errors on hosts with snapshots if I VMotion between
nodes. I would think this would be a fairly common
concern, but Googling it only results in one forum
post with the error message. What is that about, and
should I be concerned?
Not sure I can help on this one. Do they move OK? I believe that VMotion wants to move VMs without redo logs, etc... so that's probably why. Does the VM move successfully and could you commit any changes that are being saved due to snapshots?
Does that help at all?
Mark
