2V0-620 · Question #12
A High Availability (HA) cluster is configured to respond to a given number of host failures. The cluster contains virtual machines configured with these settings: - VM1 has a 1GHz CPU reservation…
The correct answer is C. The CPU reservation should be set to 2 GHz, and the memory reservation should be set to 0MB. vSphere HA slot size is determined by the largest CPU and memory reservations among all powered-on VMs; VM2's 2GHz CPU reservation is the largest, and no VM has a memory reservation, yielding a slot of 2GHz CPU and 0MB memory.
Question
A High Availability (HA) cluster is configured to respond to a given number of host failures. The cluster contains virtual machines configured with these settings:
- VM1 has a 1GHz CPU reservation and no Memory reservation
- VM2 has a 2GHz CPU reservation and no Memory reservation
- VM3 has no CPU reservation and no Memory reservation
Given this information, what is the correct slot size for the cluster?
Options
- AThe CPU Reservation should be set to 32MHz and the memory reservation should be set to
- BThe CPU reservation should be set to 1 GHz and the memory reservation should be set to 0MB
- CThe CPU reservation should be set to 2 GHz, and the memory reservation should be set to 0MB
- DThe CPU reservation should be set to 2 GHz, and the memory reservation should be set to
How the community answered
(25 responses)- A12% (3)
- B24% (6)
- C60% (15)
- D4% (1)
Why each option
vSphere HA slot size is determined by the largest CPU and memory reservations among all powered-on VMs; VM2's 2GHz CPU reservation is the largest, and no VM has a memory reservation, yielding a slot of 2GHz CPU and 0MB memory.
32MHz is the default HA CPU slot size applied only when no virtual machines have CPU reservations; since VM1 (1GHz) and VM2 (2GHz) have explicit reservations, the default is overridden and the largest reservation value must be used instead.
1GHz corresponds to VM1's CPU reservation, but HA slot sizing always uses the maximum CPU reservation across all powered-on VMs, which is VM2's 2GHz - not the smallest non-zero value.
vSphere HA admission control calculates the CPU slot size as the maximum individual VM CPU reservation across the cluster, which is VM2's 2GHz. The memory slot size equals the maximum memory reservation plus per-VM memory overhead; since no VM has an explicit memory reservation, the reservation component is 0MB, making a 2GHz CPU and 0MB memory slot the accurate result.
While this option correctly sets the CPU component to 2GHz, the truncated memory field implies a non-zero memory value, which is not consistent with the given configuration where no VM has any memory reservation.
Concept tested: vSphere HA admission control slot size calculation
Source: https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.avail.doc/GUID-FAFEFEFF-56F7-4CDF-A682-FC3C62A29A95.html
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