Which two apply when replacing a disk on a Hitachi Unified Storage (HUS) system? (Choose two.)

Question

Options

• AA wrist strap must be used when replacing disk drives.
• BThe faulty drive must be blocked using SNM2 before replacement.
• CThe HUS needs to be in maintenance mode when disks are replaced.
• DThe Web tool should be used to confirm that the replacement is successful.

Explanation

A (wrist strap) and B (block via SNM2) are the two correct procedures for HUS disk replacement.

Why A is correct: Disk drives are sensitive to electrostatic discharge (ESD). A wrist strap is mandatory when physically handling any drive to prevent ESD damage to the replacement drive and surrounding components - this is a non-negotiable hardware safety rule for HUS systems.

Why B is correct: Before physically removing the faulty drive, you must use Storage Navigator Modular 2 (SNM2) to logically "block" (take offline) the drive. This signals to the HUS controller that the drive is being replaced, preventing data corruption and allowing the system to manage the RAID rebuild correctly.

Why C is wrong: HUS systems support hot-swap, meaning drives can be replaced while the system is fully online - no maintenance mode is required. Requiring downtime would be a significant limitation for enterprise storage.

Why D is wrong: Post-replacement verification is done through SNM2, not a generic "Web tool." The wording is intentionally vague to mislead; always think "SNM2" for HUS management tasks.

Memory tip: Think "Strap Before You Swap" - the wrist Strap protects hardware, and SNM2 blocks the drive before you swap it. Both steps are "before/during" actions, which helps distinguish them from the distractor options about system mode and post-verification tools.

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