The correct action is to unassign and reassign the vHBA’s WWPN from the pool in the service profile. This resolves the UCS vHBA unavailable state caused by a WWPN conflict or corruption at the fabric level, which prevents the Fibre Channel login even though the physical ports and storage target are healthy. By forcing UCS Manager to generate a new WWPN from the pool, the server re-establishes its SAN session without requiring a reboot or service profile re-association, minimizing downtime for the critical trading application. On the Cisco DCCOR 350-601 exam, this scenario tests your understanding of UCS SAN boot troubleshooting and the distinction between fabric-level WWPN conflicts versus physical-layer issues—a common trap is to restart the server or check cables when the real problem is a stale WWPN binding. Remember: if the fabric interconnects and storage target are up but the vHBA shows “Unavailable,” think WWPN pool reassignment, not hardware reset. Memory tip: “Pool it, don’t reboot it.”
350-601 Compute Practice Question
This 350-601 practice question tests your understanding of compute. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are a data center engineer at a financial company. The production environment uses UCS B-Series blades with fabric interconnects in a clustered configuration. One of the blades (blade 3) is running a critical trading application. The server is associated with a service profile that boots from SAN using a single HBA path. During a routine network upgrade, the storage administrator reports that LUN 0 on the primary storage array is no longer accessible from blade 3. The server is still powered on, but the application is unresponsive. You check UCS Manager and see that the vHBA for blade 3 is in an 'Unavailable' state. The fabric interconnect ports show no errors. The storage array logs show that the target port is active. Which action should you take to restore connectivity with minimal downtime?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Unassign and reassign the vHBA's WWPN from the pool in the service profile
The vHBA being in an 'Unavailable' state while the fabric interconnect ports and storage target are healthy indicates a WWPN (World Wide Port Name) conflict or corruption at the fabric level. Unassigning and reassigning the vHBA's WWPN from the pool forces UCS Manager to generate a new WWPN and re-login to the SAN fabric, re-establishing the Fibre Channel session without requiring a server reboot or service profile re-association, minimizing downtime for the critical trading application.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Change the boot policy to use a secondary LUN on the same array
Why it's wrong here
Requires reconfiguration and may not be immediate
✓
Unassign and reassign the vHBA's WWPN from the pool in the service profile
Why this is correct
This forces the fabric to re-establish zoning and access
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Reset the fabric interconnect to restore cluster state
Why it's wrong here
Drastic, affects all servers
✗
Reboot the server to force re-initialization of the HBA
Why it's wrong here
Reboot would cause prolonged downtime and may not fix the issue
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a vHBA 'Unavailable' state requires a server reboot or fabric interconnect reset, when in fact the solution is to reassign the WWPN from the pool to resolve fabric login issues without disrupting the server's power state.
Detailed technical explanation
How to think about this question
In UCS, vHBA WWPNs are assigned from a pool and registered with the Fibre Channel fabric via FLOGI (Fabric Login). If the WWPN becomes stale or conflicts with another device (e.g., due to a SAN zoning change or duplicate WWN), the fabric rejects the login, placing the vHBA in 'Unavailable' state. Reassigning a new WWPN from the pool triggers a new FLOGI with a unique identifier, bypassing the conflict without requiring a server power cycle or fabric interconnect reset, leveraging UCS's stateless computing model.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Compute — This question tests Compute — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Unassign and reassign the vHBA's WWPN from the pool in the service profile — The vHBA being in an 'Unavailable' state while the fabric interconnect ports and storage target are healthy indicates a WWPN (World Wide Port Name) conflict or corruption at the fabric level. Unassigning and reassigning the vHBA's WWPN from the pool forces UCS Manager to generate a new WWPN and re-login to the SAN fabric, re-establishing the Fibre Channel session without requiring a server reboot or service profile re-association, minimizing downtime for the critical trading application.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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