A storage administrator wants to expand the current FAST Cache size from 1.2 TB to the maximum allowed size on a Dell Unity XT 880. How many 400 GB Flash 2 drives do they need to add?

Question

Options

• A24
• B12
• C5
• D10

• A
  6% (2)
• B
  83% (30)
• C
  8% (3)
• D
  3% (1)

Explanation

Option B (12 drives) is correct because the Dell Unity XT 880 has a maximum FAST Cache capacity of 6 TB, and the administrator needs to bridge a 4.8 TB gap (6 TB − 1.2 TB). Dividing 4.8 TB by the 400 GB (0.4 TB) per Flash 2 drive yields exactly 12 drives needed.

Why the distractors are wrong:

• A (24): Doubles the correct answer - a likely error from calculating total drives needed to reach 6 TB from zero (15 drives) or from miscounting raw vs. usable capacity.
• C (5): Only adds 2 TB of raw capacity, reaching 3.2 TB - well short of the 6 TB maximum; also an odd number, which violates FAST Cache's requirement to add drives in pairs.
• D (10): Adds 4 TB, landing at 5.2 TB - a plausible-sounding but incorrect stopping point that misses the 6 TB ceiling by 0.8 TB.

Memory tip: Anchor on the "6 TB ceiling" for the XT 880 - then it's simple subtraction and division: (Max − Current) ÷ Drive Size = (6 − 1.2) ÷ 0.4 = 12.

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