You need to replace the Controller Unit and the ENC Unit online on a Hitachi Unified Storage system. Which statement is correct about online replacement times?

Question

Options

• Awithin 8 minutes for the Controller Unit and within 10 minutes for the ENC
• Bwithin 10 minutes for the Controller Unit and within 8 minutes for the ENC
• Cboth Controller Unit and ENC within 8 minutes each
• Dboth Controller Unit and ENC within 10 minutes each

• A
  6% (1)
• C
  6% (1)
• D
  89% (16)

Explanation

For Hitachi Unified Storage systems, both the Controller Unit and the ENC Unit must be replaced within 10 minutes each during online replacement procedures - this is a documented operational requirement to ensure the system maintains availability and data integrity during the swap.

Why the distractors fail:

• A swaps the times (8 min for Controller, 10 min for ENC) - both values are wrong in assignment.
• B also swaps the times in the opposite direction (10 min for Controller, 8 min for ENC) - closer, but the ENC limit is still incorrect.
• C incorrectly assigns 8 minutes to both units - the actual limit is 10 minutes, not 8.

Memory tip: Think "10/10 - perfect score for both." Both units share the same 10-minute window, so there's no need to memorize different times per unit. If you see any answer that introduces an 8-minute limit for either component, eliminate it immediately.

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