An administrator has 4TB of disk space and allocates each of 100 VMs a 100GB thin-provisioned disk. The VMs use an average of 20GB of disk space each. Using the demand-based model, how much disk…

Question

Options

• A1TB
• B2TB
• C4TB
• D8TB

• A
  14% (5)
• B
  78% (28)
• C
  3% (1)
• D
  6% (2)

Explanation

B is correct because the demand-based model provisions storage based on actual usage, not allocated capacity: 100 VMs × 20GB average actual usage = 2TB required.

Why the others are wrong:

• A (1TB) is too low - there's no calculation that produces 1TB from the given values; it may tempt those who mistakenly halve the average usage.
• C (4TB) is the total available disk space, a trap for those who confuse "how much do we have" with "how much do we need."
• D (8TB) exceeds even the total disk available and likely tempts those who multiply allocated space (10TB) and misapply a ratio, or confuse thin with thick provisioning totals.

Memory tip: "Demand-based = what they actually demand." Ignore the allocated (thin-provisioned) size entirely - just multiply VM count by average real usage. If the question said capacity-based, you'd use the full 100GB × 100 = 10TB figure instead.

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