350-601 Compute Practice Question
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?
⚠ Common exam trap
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.
Answer choices
Why each option matters
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.
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
- ✗
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
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-601 exam.