Identifying Storage Device Enclosure Modules
Short answer
C The BBU module is installed in the controller enclosure, whereas the disk enclosure contains power, fan, and expansion modules.
Question
Key Takeaways
The main trap is confusing the location of power/cooling components with data protection components. Remember that BBU protects controller cache, so it stays with the controllers.
This question tests knowledge of Huawei storage hardware architecture by asking which component is absent from the disk enclosure. The correct answer is the BBU module, as it resides in the controller enclosure.
Common mistake: Candidates might incorrectly choose 'Expansion module' thinking it belongs only to controllers. However, expansion modules are standard in disk enclosures to link them to the control plane.
Expert Analysis
The question asks to identify which module is not located in the disk enclosure of a Huawei storage device. To answer this, we must distinguish between the components found in a Disk Enclosure Module (DEM) versus those found in a Controller Enclosure Module (CEM).
Disk Enclosure Module (DEM): The primary function of the DEM is to house and power hard drives or SSDs. Standard components within a DEM include:
- Power Modules: To provide electricity to the drives.
- Fan Modules: For cooling the drives and internal electronics.
- Expansion Modules: Also known as I/O modules or interface modules, these connect the disk enclosure to the controller enclosures via SAS links.
Controller Enclosure Module (CEM): This houses the active processing units (controllers) that manage data I/O. Components specific to the CEM include:
- Controller Boards: The main processing units.
- BBU (Battery Backup Unit) Modules: These are critical for protecting data in the cache during power failures. Since cache resides on the controller boards, the BBU is physically attached to or housed within the Controller Enclosure, not the Disk Enclosure.
The comment correctly identifies that the BBU module is associated with the controller enclosure because it backs up the controller's cache memory. The expansion module, however, is indeed part of the disk enclosure to facilitate connectivity. Therefore, the Power module, Expansion module, and Fan module are all present in the disk enclosure, while the BBU module is not.
Exam Strategy
When studying storage hardware, map each physical module to its logical function. If a module deals with data processing or cache protection (like BBU or Controllers), it goes in the CEM. If it deals with drive housing, basic power, or linking drives (like Fans, Power Supplies, or Expansion cards), it typically goes in the DEM.
Frequently Asked Questions
What is the function of an Expansion module in a disk enclosure?
Why is the BBU module located in the controller enclosure?
Community Votes
100% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 3 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 3
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Dhedy_Sasax 👍 1 Answered CBBU Module only on Controller enlclosure and for expansion mudule there is on disk encosure so the answer should be C. BBU Mdule
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10c5cfe 👍 1 Answered CBBU is for the controllers...
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magufr 👍 1 Answered C- C. BBU module
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