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RWY33Right
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Thanks for the reply, Duncan, and before I forget, thanks for the 4.1 HA and DRS Deep Dive (Kindle Edition, I might add) - it's been a daily read as I'm trying to figure out the best way to do this.

I did post my question as though I am trying to change the oil on an engine while it's running, but that's not the case. I will be taking full advantage of Maintenance Mode.

Where I'm struggling is when I move the host over to the new network, HA fails to configure. I have deteremined this to be because of the broadcasts used in HA. I can still VMotion, but during the migration, my HA will need non-functional or at least well beyond what I've planned for.

After a week of Diving Deep, I am looking at the das.IsolationAddress1 (forgive my spelling if I got that wrong - I won't when it counts) and trunking two uplinks for the two separate networks. Two port groups with tags. I'll play around with the default gateway to see if I can get HA to configure.

I have also considered adding a new cluster and moving the hosts and then VMs over to it one at a time.

Thanks again for the reply. When this is all over, we'll be moving to 5 and then I get to buy another book. :smileygrin:

Bart

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