Which two operations can be performed non-disruptively on Hitachi Universal Storage systems? (Choose two.)

Question

Options

• Aadding a Drive Box
• Badding a FC Host I/O Module
• Cadding an iSCSI Host I/O Module
• Dadding disk drives

Explanation

Based on Hitachi Universal Storage Platform documentation, the correct answers are A (adding a Drive Box) and D (adding disk drives).

Hitachi Universal Storage systems are designed to support online capacity expansion, meaning both Drive Boxes and individual disk drives can be added while the system remains active and serving I/O - no downtime or host disruption is required. These are hot-add operations built into the platform's architecture to support business continuity.

Adding an FC Host I/O Module (B) and an iSCSI Host I/O Module (C) are disruptive because inserting new host-facing interface cards requires the system to reconfigure its I/O infrastructure, which can affect host connectivity and typically requires a maintenance window.

Memory tip: Think "storage IN, ports OUT" - expanding storage capacity (drives and drive boxes) goes in non-disruptively, but adding new I/O ports (FC/iSCSI modules) disrupts the host connection layer. Capacity expansion = online; connectivity expansion = maintenance window.

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