Which two statements relating to the online firmware upgrade are true for Hitachi Unified Storage systems? (Choose two.)

Question

Options

• AOnly the HUS model 150 storage system supports online firmware upgrades.
• BOnline firmware upgrades should not be scheduled for periods of high CPU workload.
• COnline firmware upgrades can only be done using Storage Navigator Modular 2.
• DAll hosts must have multiple paths to the HUS when performing online firmware upgrades.

Explanation

B and D are the two correct statements.

Online firmware upgrades on Hitachi Unified Storage systems are I/O-intensive background operations, so scheduling them during high CPU workload periods risks performance degradation or instability - making B correct. D is correct because multiple host paths (multipathing) are mandatory during the upgrade; when a controller briefly goes offline during the process, alternate paths ensure hosts maintain continuous access to storage and no data loss occurs.

A is wrong because online firmware upgrades are supported across multiple HUS models, not exclusively the model 150. C is wrong because Storage Navigator Modular 2 is not the only method - upgrades can also be performed via the command-line interface (HSNM2 CLI), so restricting it to "only" SNM2 is false.

Memory tip: Think "B and D = Be Defensively prepared" - Be aware of CPU load (B), and Defend your hosts with multiple paths (D). Both are about protecting availability during a live upgrade.

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