When we're configuring proactive HA, we can choose from a few different options of host modes.
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So if we set up proactive HA in manual mode, what will happen is if there was some sort of problem detected on the hosts, V center will give us suggestions about where virtual machines should be relocated to, but it won't automatically move any VM's to different hosts, whereas with automated mode, virtual machines will be automatically migrated to hosts that are healthy, and the hosts that are in a problematic state or the degraded hosts will be entered into either quarantine or maintenance mode, depending on how we've configured proactive HA. Number one, we can choose manual mode, and this is very similar to DRS. Okay, so when we set up a cluster with proactive High Availability, there's a couple of different automation levels that we can choose. Proactive HA actually uses V motion to migrate virtual machines with no downtime.
It requires shared storage, but it's not V motion. Usually a host fails and then those virtual machines are booted up on other ESXI hosts, and that's not V motion. So proactive High Availability is actually using V motion, and don't confuse that with normal HA. We can't enable proactive High Availability unless we have DRS enabled. And one of those possibilities is that a host can be placed in something called quarantine mode. Proactive HA actually works with hardware vendors, different monitoring solutions, to find out about the health status of hardware components, like things like power supplies, memory, fan, storage systems, network systems, and then we can configure High Availability to respond according to the failures of these hardware components, so this can help us avoid downtime for our virtual machines by detecting hardware failures, and then taking that host and performing some sort of action on it. Proactive High Availability seeks to avoid preventable downtime by detecting hardware issues and proactively migrating virtual machines to different hosts. If we have an HA type event, we're going to have virtual machines that are down. Proactive High Availability is a way to prevent outages, and we know with High Availability, if you have a host failure or something along those lines, HA normally involves downtime. In this video, we'll take a look at what's new for High Availability in vSphere 6.5, and there are a few big changes to the feature set of High Availability in 6.5, some really great new features that can help us not only respond to outages, but actually prevent them, and that's where proactive HA comes in.
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