In the Exhibit, each VM has a 1GHz non-expandable reservation. If all VMs are powered on in sequence, what would be the outcome?

The correct answer is D. VM3 cannot be powered on.. A non-expandable reservation means a VM can only draw CPU resources from what its parent resource pool has explicitly reserved - it cannot borrow from unused capacity elsewhere. In the exhibit's scenario, the parent resource pool has a total reservation of only 2 GHz. When VM1 po

Section 5 – Administer and Protect vSphere 6.5 Resources

Question

Exhibit

Options

AVM4 cannot be powered on.
BVM5 cannot be powered on.
CVM6 cannot be powered on.
DVM3 cannot be powered on.

How the community answered

(45 responses)

A
29% (13)
B
7% (3)
C
18% (8)
D
47% (21)

Explanation

A non-expandable reservation means a VM can only draw CPU resources from what its parent resource pool has explicitly reserved - it cannot borrow from unused capacity elsewhere. In the exhibit's scenario, the parent resource pool has a total reservation of only 2 GHz. When VM1 powers on (consuming 1 GHz) and VM2 powers on (consuming the remaining 1 GHz), the pool's entire reserved CPU budget is exhausted. When VM3 attempts to power on, there is no remaining reservation in the parent pool to satisfy its 1 GHz non-expandable reservation, so vSphere blocks the operation with an 'insufficient resources' error. VMs 4, 5, and 6 are never reached in the sequence. If the pool were 'expandable,' VM3 could borrow unreserved capacity from its grandparent pool, but non-expandable pools strictly enforce their reservation ceiling.

Topics

#resource pools#CPU reservation#admission control#VM power on

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