Installing NIC on ESX cluster- Disable HA first?

I  have a cluster set up with HA. I need to install a new 4-port NIC on the server to expand the network.  before I shut down the server on which the card is to be installed do I need to disable HA? Or can I just shut down the server and let it disable HA itself?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I would Edit your Cluster Settings, Disable HA (untick).

Enter Maintenance Mode.

Shutdown Server.

Check, if you are using a Vendor Server (HP, Dell, IBM), all firmwares are updated to match ESXi latest version and/or update ESXi.

As you may experience, network card, issues, lack of ports, on the 4 port.

Then when the server comes up, check networking , and then enable HA and TEST!

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Trent SmithCommented:
HA will know that the system is unavailable as soon as it gets turned off.  There is no reason that you should have to disable HA.  Just make sure that you have all the machines off the host before powering it down.
wannabecraigAuthor Commented:
ok, so two different opinions.  

Let's say I turn it off, when I turn it back on, how do I test?
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wannabecraigAuthor Commented:
It looks like if I test I'll cause the outage?  So all VMs will restart on non-isolated host.
That will cause downtime while restarting right?
Trent SmithCommented:
I would schedule downtime to do any type of testing.  You want to always plan for the worst.
wannabecraigAuthor Commented:
I get that, we're 24x7 company so it's much harder than that.
We had a real outage a few months ago and it was fine so happy to just let it go as is for now.
Trent SmithCommented:
I also work at a 24x7 shop but you should schedule some testing for this just to make sure it works like it should.  You don't want to find out in a real emergency that something isn't working properly.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Create a single VM on the test box.

enable HA.

pull out the power cord.

VM should restart on other Host, within 1-2 minutes.

wannabecraigAuthor Commented:
ok, got it.  I can probably do this this evening.

I need to install the same NIC on other box so I'll do this test once I've installed that NIC.
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