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NetApp Exam NS0-093 Topic 3 Question 16 Discussion

Actual exam question for NetApp's NS0-093 exam
Question #: 16
Topic #: 3
[All NS0-093 Questions]

A SAS connection is reporting a single PHY down.

What are the two most likely causes? (Choose two.)

Show Suggested Answer Hide Answer
Suggested Answer: A, C

Understanding a Single PHY Down Issue:

In SAS environments, a PHY represents a physical layer connection between devices.

When a single PHY reports a 'down' status, it typically indicates an issue with the physical connectivity or the associated hardware.

Cause 1: Improperly Seated Cable

If the SAS cable is not properly seated in the port, the connection for one or more PHYs may fail.

Reseating the cable on both ends (controller and shelf) often resolves the issue.

Cause 2: Defective Cable

A damaged or faulty SAS cable can cause PHY errors.

Replacing the cable and verifying the connection resolves the issue in this case.

Why Other Options Are Not Likely:

B . Outdated IOM firmware: While outdated firmware can cause other issues, it rarely affects only a single PHY.

D . Offline shelf: If an entire shelf is offline, more than one PHY would typically be affected, as multiple connections are involved in SAS stacks.

NetApp Reference Documentation:

Found in the 'ONTAP SAS Cabling Guide' and 'Shelf Troubleshooting Guide'. These documents detail troubleshooting for PHY errors and common SAS hardware issues.


Contribute your Thoughts:

Crista
3 hours ago
I think the outdated I/O module firmware could also be a possible cause.
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Gilberto
4 days ago
I believe it could also be an offline shelf in the stack causing the issue.
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Brunilda
6 days ago
I agree with Lavina. Those two reasons make sense.
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Stephane
14 days ago
Hmm, I'd go with 'improperly seated cable' and 'defective cable' on this one. Gotta keep those connections tight!
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Yuonne
2 days ago
I agree, a loose cable can cause issues.
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Lavina
17 days ago
I think the most likely causes are improperly seated cable and defective cable.
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