SDLCSA Questions and Answers

Removing the LPIO (Low-Profile IO) board from the PCIe tray in the SYS-421GE-TNHR2-LCCinvolves:

Remove PCIe air shroud: Clears access to components (standard in Supermicro designs).

Remove all AOC NIC cards: Disconnects cards on the LPIO board for unobstructed removal.

Remove metal bracket holding down LPIO board: Unscrews (typically 2 screws) the bracket securing the board.Option B follows Supermicro’s logical service order (e.g., SYS-420GP-TNAR), ensuring safe access in DLC systems. A (GPU) is unrelated, C (tray removals) is excessive, and D (fans) is irrelevant. B aligns with Supermicro’s DLC modularity, making it correct.References:Supermicro PCIe tray service guides, DLC system IO removal protocols.

The side bracket in the SYS-421GE-TNHR2-LCC, likely housing add-on components, is secured with2 screws on the top and 2 on the side, a balanced approach seen in Supermicro’s modular designs (e.g., SYS-420GP-TNAR). This distribution ensures stability and accessibility, common in DLC systems with dense configurations. A (all top) or C (3 top) skews placement, while B (1 top) is insufficient. D aligns with Supermicro’s chassis engineering, making it correct.References:Supermicro chassis bracket guides, DLC system structural design.

Removing an AOC NIC card in Supermicro systems like the SYS-421GE-TNHR2-LCC requires more than pulling straight up. Per standard procedures (e.g., SYS-420GP-TNAR), you must first unscrew the card from its bracket (1 screw) and release any retaining mechanisms (e.g., PCIe slot latch). Simply pulling risks damage to the card or slot, especially in DLC setups with dense configurations. False (B) reflects Supermicro’s emphasis on careful hardware handling, making it the correct answer.References:Supermicro AOC card removal guides, DLC system component safety.

Removing a DIMM (memory module) in Supermicro systems like the SYS-421GE-TNHR2-LCC requires only ESD gloves for safety;no additional toolsare needed. DIMMs are released by pushing down on slot latches and lifting out by hand, per Supermicro manuals (e.g., SYS-420GP-TNAR). A (pliers) risks damage, B (torque bit) and D (screwdriver) are for screws, not DIMMs. Supermicro’s DLC systems maintain standard DIMM serviceability, making C correct.References:Supermicro DIMM replacement guides, DLC system maintenance standards.

In Supermicro systems, the air shroud aligns with the motherboard tray via tabs and slots. The correct feature is3 tabs on the front of the air shroud aligning with 3 slots on top of the fan board, a common design (e.g., SYS-420GP-TNAR) for precise placement over fans and CPUs. B (4 tabs) and C (2 tabs) deviate from standard counts, while D (PCIe board) misplaces the alignment. Supermicro’s DLC hybrid cooling ensures shroud accuracy, making A correct.References:Supermicro air shroud installation guides, DLC system cooling alignment.

The air shroud in Supermicro systems, including those with Direct Liquid Cooling (DLC) solutions like the SYS-421GE-TNHR2-LCC, is typically designed to direct airflow (or in hybrid systems, assist with liquid cooling efficiency) and is made of plastic or composite materials. Based on Supermicro’s standard design practices seen in technical documentation and product images (e.g., SYS-420GP-TNAR, a similar GPU server with DLC), the PCIe tray’s air shroud is consistently black. This color aids in heat absorption and dissipation, aligning with Supermicro’s focus on thermal efficiency in DLC systems, where cold plates and coolant distribution units (CDUs) manage heat directly at the chip level. White or clear shrouds are less common due to aesthetic and thermal considerations, and “opaque” is not a specific color designation. Thus, black is the correct choice, reflecting Supermicro’s engineering standards for high-performance computing components.References:Supermicro product images and manuals (e.g., SYS-420GP-TNAR User Manual), general DLC solution descriptions.

In Supermicro’s high-end servers like the SYS-421GE-TNHR2-LCC, PSUs are typically located at the back of the chassis for accessibility and cooling efficiency, a design consistent with DLC rack-scale solutions (e.g., SYS-420GP-TNAR). The mention of a “dummy PSU tray” suggests a placeholder or empty slot, common in modular designs to maintain airflow or allow future expansion. This layout is standard in Supermicro’s DLC systems, where PSUs power both compute and cooling components (e.g., pumps, CDUs). No contradicting evidence exists, and True (A) aligns with Supermicro’s chassis architecture, making it the correct answer.

References: Supermicro chassis design specs, DLC system PSU placement.