A vSphere HA cluster with four hosts has admission control configured to tolerate one host failure.
Which statement is true if a fifth host is added?
A.
CPU and Memory capacity will be set to 50%.
B.
CPU and Memory capacity will be set to 30%.
C.
CPU and Memory capacity will be set to 25%.
D.
CPU and Memory capacity will be set to 20%.
D
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D = 20% Reservation per Hosts for one host failure
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D, 100/5=20
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20% = 1/5
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So I think this might be more of a question as to if it will automatically balance the reservation per host in your cluster when you add the 5 host. In this case, where you have configured it to tolerate one host failure it will automatically adjust. If you have manually set it to 25% before adding the 5 host to your cluster, it will not adjust.
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Would say C
When one host is down the rest have to takeover VMs. So with 20% and 4 hosts remaining we have only 4×20 = 80% of host available resources. With 25% with one failed host all will be OK, because remaining 4 have 4×25 = 100% of “host” available resources
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D is correct, as there has to be a reservation of 100% / 5 Hosts to compensate one host failure. Thats exactly 20%.
4 Hosts had the reservation of 25%, to compensate a single host failure.
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In this case reservation % has been calculated to tolerate one host failure, so it’s been set to 25% (1/4)
If you add a 5th host, the reservation % will not change dinamically, it will remain 25%. You will have to manually adjust the setting to 20% (1/5) to keep tolerating 1 host failure.
C is correct.
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I stand corrected, this was true in 6.0 but has changed in 6.5, where %s are automatically calculated by vcenter. Correct answer is D.
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