2V0-621 · Question #258
An administrator has configured a cluster with the Host Failures Cluster Tolerates admission control policy, as shown in the Exhibit: Based on the exhibit, which two statements are true? (Choose two.)
The correct answer is C. The number of slots per cluster node is three. D. The cluster can sustain loss of only one node. The 'Host Failures Cluster Tolerates' admission control policy calculates slots per host from reserved resources, and the exhibit shows a cluster configured to survive exactly one host failure with three slots per node.
Question
An administrator has configured a cluster with the Host Failures Cluster Tolerates admission control policy, as shown in the Exhibit:
Based on the exhibit, which two statements are true? (Choose two.)
Exhibit
Options
- AThe cluster can sustain the loss of two nodes.
- BThe number of slots per cluster node is four.
- CThe number of slots per cluster node is three.
- DThe cluster can sustain loss of only one node.
How the community answered
(69 responses)- A13% (9)
- B25% (17)
- C62% (43)
Why each option
The 'Host Failures Cluster Tolerates' admission control policy calculates slots per host from reserved resources, and the exhibit shows a cluster configured to survive exactly one host failure with three slots per node.
Sustaining the loss of two nodes would require the 'Host Failures Cluster Tolerates' setting to be configured as 2 and sufficient reserved capacity across remaining hosts; the exhibit shows the value is set to 1, which limits tolerance to a single host failure.
The slot calculation derived from the exhibit's CPU and memory reservation values produces three slots per node, not four; four slots per node would only result from a smaller slot size or greater per-host resource availability than what is shown.
vSphere HA calculates slot size using the largest CPU and memory reservations among all powered-on VMs in the cluster, then divides each host's available resources by that slot size. Based on the resource values shown in the exhibit, this calculation yields three available slots per host node. This means each host can protect three VMs under the current configuration, not four.
The exhibit shows the 'Host Failures Cluster Tolerates' value is set to 1, so HA reserves capacity equivalent to one host's worth of slots across the remaining nodes. A second simultaneous host failure would exhaust that reserved capacity and prevent some VMs from being restarted, confirming the cluster can sustain the loss of only one node.
Concept tested: vSphere HA slot-based admission control and failure tolerance calculation
Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.avail.doc/GUID-C4F71995-999F-483B-8FAF-E25F8C46725B.html
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