Which two tasks can be performed online on a Hitachi Unified Storage system? (Choose two.)

Question

Options

• Areplacing a SFP FC Host Connector
• Bremoving a Drive Box
• Cupgrading a Flash Memory
• Dreplacing a Controller Unit

Explanation

The two correct answers are A (replacing a SFP FC Host Connector) and D (replacing a Controller Unit).

SFP (Small Form-factor Pluggable) FC Host Connectors are hot-pluggable by design, making them swappable while the system continues serving I/O - no interruption to host connectivity is required. Controller Units in the HUS system operate in a redundant dual-controller architecture, allowing one controller to be replaced online while the partner controller maintains data access; Hitachi specifically supports this non-disruptive controller replacement as a key enterprise availability feature.

Removing a Drive Box (B) is an offline operation because it physically disconnects an entire shelf of drives, disrupting data paths regardless of redundancy. Upgrading Flash Memory (C) - typically referring to cache memory modules - requires the associated controller to be taken offline, as the cache cannot be safely swapped while actively managing I/O buffers.

Memory tip: Think "hot = small." SFPs and controllers have built-in redundancy/hot-swap design, so they go online. Drive Boxes and Flash Memory are larger, non-redundant hardware changes that take the system down - if swapping it means losing an entire shelf or controller cache, it's offline.

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