A storage administrator selects 11 drives with RAlD 5 protection for a new Dynamic pool. What is the RAID width of the new pool?

Question

Options

• A10+1
• B9+2
• C8+1
• D9+1

• B
  7% (2)
• C
  90% (27)
• D
  3% (1)

Explanation

Option C (8+1) is correct because HPE Dynamic Disk Pools (DDP) with RAID 5 protection using 11 drives allocate 9 drives to the active RAID stripe (8 data + 1 parity) and reserve 2 drives for reconstruction capacity within the pool - that's the standard DDP design for 11-drive RAID 5.

Why the distractors are wrong:

• A (10+1): Would consume all 11 drives in the stripe with no reconstruction reserve, violating DDP's requirement for reserved capacity.
• B (9+2): Two parity drives (+2) is the signature of RAID 6, not RAID 5; RAID 5 always uses exactly one parity drive.
• D (9+1): A 10-drive stripe would leave only 1 reserved drive, which doesn't match the 2-drive reserve standard for 11-drive DDP RAID 5 pools.

Memory tip: Think "RAID 5 = single parity, DDP = 2 reserves." With 11 drives: subtract 2 reserved = 9 in stripe, then split 8 data + 1 parity → 8+1.

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