How many Disk Boards (DKBs) are included in a VSP E1090 system with at least one Drive Box (DB) attached?

Question

Options

• A1
• B2
• C4
• D8

• A
  3% (1)
• B
  80% (32)
• C
  8% (3)
• D
  10% (4)

Explanation

In a VSP E1090 with at least one Drive Box attached, exactly 2 Disk Boards (DKBs) are required - one per DKB slot - because they work as a redundant pair to manage I/O between the controller and the attached drive boxes. This pairing is mandatory as soon as any DB is added, ensuring path redundancy and balanced load across the backend fabric.

Why the other options are wrong:

• A (1): A single DKB would create a single point of failure for drive connectivity; Hitachi's architecture mandates paired DKBs for redundancy.
• C (4) and D (8): These figures exceed the base DKB requirement; additional DKBs beyond the initial pair would only apply in specific expanded configurations or different VSP models (such as the E990 or G/F series with higher drive counts), not as the baseline for a DB-attached E1090.

Memory tip: Think "Double up for Drive Boxes" - any time a DB is attached to the E1090, you need a DKB pair (2), mirroring how Hitachi generally favors dual-controller redundancy throughout VSP architecture.

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