What are three characteristics of the Hitachi Unified Storage systems active/active controller design? (Choose three.)

Question

Options

• ASNM2 GUI is used to turn on active/active controller processing.
• BWorkload is automatically balanced between controllers.
• CWhen creating a LUN the default controller must be selected.
• DThe processor of Ctlr0 can access the Fibre Channel (FC) ports of Ctrl1.
• ENon disruptive firmware upgrade is possible even if a host is connected by only one path.

Explanation

Based on Hitachi Unified Storage documentation and architecture, the correct answers are B, D, and E.

Why B, D, and E are correct: In a true active/active controller design, both controllers simultaneously process I/O, so workload is automatically balanced between them (B) without manual intervention. Because both controllers share resources, Ctlr0's processor can transparently access Ctrl1's FC ports (D), enabling seamless failover and cross-controller I/O handling. Since one controller can always take over while the other updates, non-disruptive firmware upgrades are possible even over a single path (E) - the active controller absorbs all I/O while its peer upgrades.

Why the distractors are wrong:

• A is wrong because active/active is an inherent architectural feature - it is always enabled and does not require an administrator to "turn it on" via the SNM2 GUI.
• C is wrong because selecting a default/preferred controller per LUN is a characteristic of active/passive designs. In active/active, both controllers are peers, so no ownership assignment is needed at LUN creation time.

Memory tip: Think "BAD" choices knock out the active/active idea - option A (manual toggle) and C (owner selection) both imply one controller is dominant, which contradicts active/active. The three correct answers all reflect symmetry and autonomy between controllers.

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