Chapter_8

Chapter_8 - VCP: VMware Certified Professional on vSphere 4...

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VCP: VMware Certified Professional on vSphere 4 Study Guide
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Chapter 8 Managing and Creating VMware Clusters 2
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Topics Create and Configure VMware Clusters Enable a Fault Tolerant Virtual Machine Create and Configure Resource Pools 3
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VMware Clustering Datacenter object is a prerequisite All ESX host CPU and memory resources are added to the collective cluster resources VMs no longer appear on their individual ESX hosts as shown below 4
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Adding ESX/ESXi Hosts to a Cluster Grafting vs. importing an ESX host into a cluster 5
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Removing ESX hosts from a cluster VMs must be cleared off the target host by Manually removing them Vmotioning them Shutting them down Storage-Vmotioning them to an ESX host’s local storage to ensure the cluster doesn’t move the VMs to another ESX host in the cluster 6
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VMware High Availability (HA) Restarts VMs should an ESX host fail and take down the VMs HA Prerequisites All VMs must be able to boot on every ESX host. This means: VM files must be on shared storage, Storage must be configured, accessible, and read/writable on every ESX host All ESX host networking must be configured identically All ESX hosts must have some spare and unused capacity If a virtual machine can successfully VMotion, HA standards have been surpassed 7
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HA terminology and Concepts HA Heartbeats For ESX, the Service Console port is used for heartbeats. For ESXi, the VMkernel ports used for management are used for heartbeats. Default heartbeat timeout for HA is 12 seconds Host Isolation Response When a host is isolated from its peers, it shuts off its VMs so that its peers in the HA cluster will succeed in their attempt to take control of and boot the VMs Can be particularly dangerous in the event of a network switch failure Two configurable failsafe measures: Configure the cluster-wide host isolation response to leave VMs powered on Configure a redundant heartbeat network. Heartbeat Network Redundancy
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Chapter_8 - VCP: VMware Certified Professional on vSphere 4...

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