vCenter 6.0 Upgrade and Host agent Updates

I am in the planning phase for upgrading from vCEnter 5.1 to 6.0 update 1. I believe one of the final dialog boxes is to push the updated vpxa agent to all host, I prefer to do a phased approach and do this in small batches after the fact. Any problems doing this? I have read the host agent upgrade sets a reboot flag on the host, is this true?

I am using the same DB, but moving to a new server. What happens if I do not backup or copy over the SSL certificates from the old vCenter server from the host?

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compdigit44Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
We have never seen a ESXi host reboot, after the Agent has been updated.

As soon as vCenter Server connects to the ESXi 5.1 host, it will push the new agent out to the host, in the first communication, transfer it does.

An issue we have seen, is where the Agent Upgrade on the Host fails, and you will have to look in the logs, to find out why it has failed.

Often this could be due to disk space issues.
compdigit44Author Commented:
So there is not way to delay the host agent upgrade correct?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Do not connect the ESXi 5.1 Host to vCenter Server 6.0 U1. (not helpful).

vCenter Server 6.0U1 cannot manage the ESXi 5.1 host without deploying the agent, and it does this immediately, vCenter Server connects to the ESXi host, and then detects the agent is out of date, and will the proceed to update.
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compdigit44Author Commented:
So in a nutshell with 110+ ESXi 5.1 host after I upgrade vCenter and mind you I am moving to a new server but reusing the old name and IP, all host will be upgraded at once???
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The agent will be pushed out from vCenter Server, the moment communication starts with the hosts.
compdigit44Author Commented:
no foreseen issues oh great one..
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
disk space! as mentioned!

If you pan for some upgrades will fail, you will be fine.

Remember vCenter Server is only a management server, and does not cause VM outages, only humans do that!

We prefer to do the ripout host, and replace host, test host, check host, check with test VMs, add back to cluster.
compdigit44Author Commented:
Can you explain


We prefer to do the ripout host, and replace host, test host, check host, check with test VMs, add back to cluster.

How can you do this if the agent is upgraded on all host on first communication? Also we have a large environment and cannot take host out of vcenter
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You will always have the issue with vCenter pushing a new agent to a host, which could cause you with a change control issue, or failure of host.

1. VMs are vMotion-ed off Host.
2. Host removed from vCenter server.
3. Host re-installed with 6.0.
4. Added to vCenter Server.
5. Reconfigured, tested, pre-flight checks.
6. VM added, vMotio checked.
7. Added to cluster.
8. Tested.
9. VM checks.
10. move to Cluster.

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compdigit44Author Commented:
As always thank you for the great advice..
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
no problems.
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