Hello, the main difference I find between for a warm spare or stacking would be how you want them to reboot on a firmware update. On a switch stack the switches will all reboot at once. while with a warm spare I think you can do the firmware updates with a stagged update, so that during the update you can still have a switch up and working. Less down time. I have some MS425 on my ESXI Clusters and I like having them not stacked so I can have no downtime during a switch firmware update. you just have to make sure you have links for both switches to work when the other is offline.
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