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A vSphere administrator attempts to move a powered on virtual machine into a resource pool that is configured in an HA/DRS cluster. The operation fails.
What condition would cause this behavior?
A. HA admission control prevented the movement of the virtual machine due to insufficient resources.
B. Resource pool admission control prevented the movement of the virtual machine due to insufficient resources.
C. The virtual machine was not powered off before being moved into the resource pool.
D. The virtual machine’s hardware level did not match the level of the existing virtual machines in the resource pool.
Correct Answer: B
Explanation/Reference:
Explanation:
When moving a VM into a resource pool, if the virtual machine is powered on and the destination resource pool does not have enough CPU or memory to guarantee the virtual machine’s reservation, the move fails because admission control does not allow it. An error dialog box explains the situation. vCenter Server uses admission control to ensure that sufficient resources are available in a cluster to provide failover protection and to ensure that virtual machine resource reservations are respected.
Three types of admission control are available.
Host: Ensures that a host has sufficient resources to satisfy the reservations of all virtual machines running on it.
Resource Pool: Ensures that a resource pool has sufficient resources to satisfy the reservations, shares, and limits of all virtual machines associated with it. vSphere HA: Ensures that sufficient resources in the cluster are reserved for virtual machine recovery in the event of host failure.
Admission control imposes constraints on resource usage and any action that would violate these constraints is not permitted. Examples of actions that could be disallowed include the following:
Powering on a virtual machine.
Migrating a virtual machine onto a host or into a cluster or resource pool.
Increasing the CPU or memory reservation of a virtual machine.
Incorrect Answers:
A: HA Admission Control ensures that sufficient resources in the cluster are reserved for virtual machine recovery in the event of host failure. However, the resources reserved by HA admission control are reserved in the root resource pool. In this question, the administrator is attempting to move the VM into a resource pool that has been configured in the cluster. A ‘configured’ resource pool will be a child resource pool of the root resource pool. Therefore, HA admission control would not be applied when moving the VM to the resource pool. Only the resource pool admission control would be applied. Therefore, this answer is incorrect.
C: A virtual machine does not need to be powered off before being moved into a resource pool. Therefore, this answer is incorrect.
D: The virtual machine’s hardware level does not need to match match the level of the existing virtual machines in a resource pool to move the virtual machine into the resource pool. Therefore, this answer is incorrect.
References:
http://pubs.vmware.com/vsphere-55/index.jsp#com.vmware.vsphere.avail.doc/GUID-53F6938C-96E5-4F67-9A6E-479F5A894571.html