010-151 · Question #40
Which two statements about DIMM replacement in Cisco UCS Servers are true? (Choose two.)
The correct answer is A. In blade servers, DIMMs can be installed in either 1, 2, 4, or 8 DIMMs per channel. C. In servers that require pairs of DIMMs, the pairs must be identical (manufacturer, size, part #, and. Cisco UCS servers enforce specific DIMM population and compatibility rules to maintain memory stability and performance. Blade servers allow flexible per-channel population, and servers requiring pairs mandate exactly matched DIMMs.
Question
Which two statements about DIMM replacement in Cisco UCS Servers are true? (Choose two.)
Options
- AIn blade servers, DIMMs can be installed in either 1, 2, 4, or 8 DIMMs per channel.
- BRack-mount and blade servers have memory fault LEDs that indicate which DIMM requires
- CIn servers that require pairs of DIMMs, the pairs must be identical (manufacturer, size, part #, and
- DIf the memory in a server is not fully populated, you can install DIMMs in any open slot.
How the community answered
(32 responses)- A72% (23)
- B6% (2)
- D22% (7)
Why each option
Cisco UCS servers enforce specific DIMM population and compatibility rules to maintain memory stability and performance. Blade servers allow flexible per-channel population, and servers requiring pairs mandate exactly matched DIMMs.
Cisco UCS blade servers are designed to support DIMM populations of 1, 2, 4, or 8 DIMMs per memory channel depending on the server model and generation, providing flexibility for partial and full memory configurations.
Not all Cisco UCS rack-mount and blade server models include dedicated per-DIMM fault LEDs; LED availability varies by server generation and model, making this an overgeneralized and inaccurate statement.
In Cisco UCS servers that require DIMMs to be installed in pairs, both DIMMs in each pair must be identical in manufacturer, size, and part number to prevent memory errors, mismatched timing faults, or POST failures.
Cisco UCS servers require DIMMs to be populated in a specific slot sequence defined in the hardware installation guide; installing DIMMs in arbitrary open slots violates the population order and can prevent the server from posting or cause memory faults.
Concept tested: Cisco UCS DIMM installation rules and population compatibility
Source: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/hw/C220M5/install/C220M5/b_Cisco_UCS_C220M5_Install_Upgrade_Guide/b_Cisco_UCS_C220M5_Install_Upgrade_Guide_chapter_011.html
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