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A vSphere administrator needs to configure a virtual machine to meet a guaranteed CPU performance profile.
Which configuration setting could the administrator choose?
A. Set the CPU Limit to High
B. Set the CPU Shares to 500MHz
C. Set the CPU Guarantee to High
D. Set the CPU Reservation to 500MHz
Correct Answer: D
Explanation/Reference:
Explanation:
D: A reservation specifies the guaranteed minimum allocation for a virtual machine. vCenter Server or ESXi allows you to power on a virtual machine only if there are enough unreserved resources to satisfy the reservation of the virtual machine. The server guarantees that amount even when the physical server is heavily loaded. The reservation is expressed in concrete units (megahertz or megabytes). Reservation defaults to 0. You can specify a reservation if you need to guarantee that the minimum required amounts of CPU or memory are always available for the virtual machine. Thus a reservation with a specified MHz value will allow you to configure a virtual machine to meet a guaranteed CPU performance profile.
Incorrect Answers:
A: The Limit is a user defined setting that is used to place a limit on the consumption of CPU time for a virtual machine. This value is expressed in MHz. This is not what is required.
B: Each virtual machine is granted a number of CPU shares. The more shares a virtual machine has, the more often it gets a time slice of a CPU when there is no CPU idle time. Shares represent a relative metric for allocating CPU capacity.
C: Guarantee is not a user-defined setting that can be configured to allocate CPU resources.
References:
https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.vm_admin.doc%2FGUID-83853A93-E36E-48AB-8F78-65A28C418EE2.html
https://pubs.vmware.com/vsphere-51/index.jsp?topic=%2Fcom.vmware.vsphere.resmgmt.doc%2FGUID-8B88D3D8-E9D9-4C05-A065-B3DE1FFFB401.html