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Question 74 - D-PSC-MN-01 discussion

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A platform engineer needs to swap an NVDIMM battery. What prerequisite conditions are required to prevent data loss when removing the NVDIMM battery?

A.

None -- the NVDIMM battery is hot-swappable

Answers
A.

None -- the NVDIMM battery is hot-swappable

B.

The node is switched off and must be removed from the power feed

Answers
B.

The node is switched off and must be removed from the power feed

C.

LEDs on the NVDIMM battery must be off

Answers
C.

LEDs on the NVDIMM battery must be off

D.

Node, LEDs on the node, LEDs on the NVDIMM, and LEDs on the NVDIMM battery must be off

Answers
D.

Node, LEDs on the node, LEDs on the NVDIMM, and LEDs on the NVDIMM battery must be off

Suggested answer: D

Explanation:

Non-Volatile Dual In-line Memory Modules (NVDIMMs) are used in Dell EMC PowerScale nodes to enhance write performance and data protection. The NVDIMM battery provides backup power to ensure data in the NVDIMM is preserved during a power loss.

Prerequisite Conditions:

Complete Power Off:

The node must be completely powered off.

All LEDs on the node, NVDIMM, and NVDIMM battery must be off to ensure no power is supplied.

Prevent Data Loss:

Removing the NVDIMM battery while power is present can lead to data loss in the NVDIMM.

Ensuring all LEDs are off confirms that the NVDIMM has flushed its data and is safe to handle.

Why Other Options Are Incorrect:

Option A (Hot-Swappable):

The NVDIMM battery is not hot-swappable.

Option B (Node Off and Removed from Power Feed):

While the node should be off, additional confirmation of LEDs being off is necessary.

Option C (LEDs on NVDIMM Battery Must Be Off):

Not sufficient; all related LEDs must be off.

Dell PowerScale

Reference:

Dell EMC PowerScale Hardware Replacement Guide:

Section on NVDIMM Battery Replacement:

Specifies that the node and all related LEDs must be off before removing the NVDIMM battery.

Provides step-by-step procedures to safely replace the battery.

Safety Precautions:

Wear ESD protection when handling internal components.

Verify power status to prevent hardware damage and data loss.

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asked 29/10/2024
Ben Spiers
34 questions
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