Eight identical hosts can each support 20 users. During a rollout, 100 users are concurrent. The team must tolerate one additional failure among hosts still serving users. What is the largest batch that can be taken unavailable at once without adding hosts?

✓ Correct answer

• 2 hosts.

The available host count after maintenance and one failure must be at least ceiling(100 ÷ 20) = 5. Therefore 8 − batch − 1 ≥ 5, so batch ≤ 2. Option explanations: A. 2 hosts.: Six remain after maintenance; after one failure, five provide exactly 100 sessions. B. 4 hosts.: Four provide only 80 sessions even before the extra failure. C. 1 host.: It is safe but smaller than the maximum batch allowed by the stated arithmetic. D. 3 hosts.: Five remain, but one failure leaves four and only 80 sessions. Sources: Session host sizing guidelines — https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/session-host-virtual-machine-sizing-guidelines

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