You have been asked to review a vSphere HA design. The admission control policy is set to "The number of host failures tolerated." The virtual machines vary in size, and use of VM-based reservations is common. Which of the following should be recommended? (Choose three)
Answer(s): A,B,C
An admission control policy tells VMware HA how to calculate the resources it needs to reserve for a cluster. It uses a combination of memory and CPU reservation configuration or, if no configuration exists, a default low reservation. Chapter 4, The Importance of vMotion, VMware HA, and Fault Tolerance
When given a project requirement for RTO to be satisfied, VMware HA can be used with admission control enabled.
Answer(s): A
DRS rules can help satisfy availability concerns within a cluster; however, if used extensively, they may cause a performance issue with vCenter.
DRS rules can be extremely useful for a number of reasons, such as redundancy, network bandwidth, and performance management. However, if they are used extensively, functionality such as DPM may become less effective (that is, hosts will not be able to power off due to rules and will use more power than required).Chapter 4, Management/Platform Design
You are reviewing a VMware vSphere 5 cluster design. The system is designed to run DPM in fully automated mode. DPM in fully automated mode evacuate all templates when placed into standby mode.
Answer(s): B
DPM will not move powered-off virtual machines or templates. A real-life workaround is to turn off fully automated DRS for these machines on a case-by-case basis and register them to a specific host in the cluster for deployment usage.Chapter 4, Management/Platform Design
Has the configurable option "Failure Detection Time" in VMware HA has been removed in vSphere 5?
vSphere 5 will use datastore heartbeats in a disaster. Thus, this setting is no longer available or supported in VMware vSphere 5. Chapter 4, The Importance of vMotion, VMware HA, and Fault Tolerance
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