NetApp Accredited Hardware Support Engineer Questions and Answers
Question 17
A SAS connection is reporting a single PHY down.
What are the two most likely causes? (Choose two.)
Options:
A.
improperly seated cable
B.
outdated I/O module (IOM1 firmware
C.
defective cable
D.
an offline shelf in the stack
Answer:
A, C
Explanation:
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B. Outdated IOM firmware: While outdated firmware can cause other issues, it rarely affects only a single PHY.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.
Question 18
Which two statements regarding drive 1.2.3.L1 are true? (Choose two.)
Options:
A.
The drive is in shelf 2.
B.
The drive is in bay 3.
C.
The drive is in bay 2.
D.
The drive is in shelf 1.
Answer:
A, B
Explanation:
The identifier 1.2.3.L1 follows the NetApp disk naming convention, which specifies the location of the drive in the system. Here is the breakdown of the identifier:
1: This indicates the stack ID or loop ID. It represents the stack number in the disk shelf configuration.
2: This indicates the shelf ID. In this case, the drive is located in shelf 2.
3: This indicates the bay ID or slot number within the shelf. The drive is in bay 3.
L1: This represents the logical port or logical disk identifier.
The shelf ID is 2, so the drive is in shelf 2 (A is correct).
The bay ID is 3, so the drive is in bay 3 (B is correct).
C. The drive is in bay 2: The bay ID is explicitly specified as 3, not 2.
D. The drive is in shelf 1: The shelf ID is clearly given as 2, not 1.
NetApp Hardware Universe documentation provides details on disk naming conventions.
The "ONTAP Disk Management Guide" includes a full explanation of disk IDs and their interpretation.
How to Interpret Disk Identifier 1.2.3.L1:Why Other Options Are Incorrect:References:
