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vSphere High Performance Essentials by Christian Stankowic

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High Availability

To address the availability requirements of important workloads, vSphere HA ensures that VMs are restarted on alternative nodes in the cluster once an ESXi host failure arises. However, calculating the right amount of resource reservation (such as, spare hosts) when planning the utilization of vSphere HA is not always easy. In this section, we will focus on virtual machine monitoring and the various possibilities to reserve resources for failover scenarios.

Virtual machine monitoring

A very useful subcomponent of vSphere HA offers the possibility to monitor virtual machines. Once enabled, it communicates with the installed VMware Tools software and also monitors the disk and network I/O activity of a VM. If IO activity and VMware ...

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