From the course: VMware vSphere 6.5 Essential Training Part 2

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DRS and resource fragmentation

DRS and resource fragmentation - vSphere Tutorial

From the course: VMware vSphere 6.5 Essential Training Part 2

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DRS and resource fragmentation

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- [Narrator] In this video, I'll explain DRS and resource fragmentation, and how DRS can help in a high availability event. In the slide you see here, we have a four host cluster. We have ESXi01, zero-two, zero-three and zero-four. And if you'll notice on host ESXi04, I've got a really large virtual machine running. Now with a high availability event, we're potentially losing an ESXi host. So let's say in this scenario, we lose host ESXi04. That host is now failed. And I have this really large virtual machine, that isn't going to fit comfortably on any of the surviving ESXi hosts. Maybe I even have a reservation that will prevent it from booting on any of these other hosts. This is called resource fragmentation. The remaining hosts have plenty of capacity to run this virtual machine. However, those resources are spread out in small chunks over a group of hosts. So no single host has the resources necessary to run this VM. This is where DRS can help us. If an ESXi host fails, HA is…

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