After the removal of a failed disk drive on a Hitachi Unified Storage system, how long should you wait before inserting a new drive?

Question

Options

• Ano need to wait
• Bmore than 5 seconds
• Cmore than 10 seconds
• Dmore than 20 seconds

• A
  3% (1)
• B
  6% (2)
• C
  3% (1)
• D
  88% (29)

Explanation

On Hitachi Unified Storage systems, you must wait more than 20 seconds after removing a failed drive before inserting a replacement, giving the system time to fully detect and process the drive removal, update internal state, and prepare the slot for a new device. Inserting too quickly (options A, B, or C) risks the system not recognizing the new drive correctly, potentially causing errors, failed rebuilds, or data corruption. Option A is wrong because an immediate swap can confuse the controller; options B and C are wrong because 5 or 10 seconds are insufficient for the internal cleanup and slot reset to complete. Memory tip: Think "20 seconds = 20% margin of safety" - the larger the number among the choices, the safer the storage system, so always pick the longest wait when dealing with hot-swap drive procedures on enterprise arrays.

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