350-601 Compute Practice Question
An engineer is troubleshooting a Cisco UCS B-Series blade that fails to boot. The service profile is associated and the boot policy is set to 'SAN Boot'. The storage administrator confirms the LUN is properly mapped to the WWPN. Which check should the engineer perform first?
⚠ Common exam trap
Cisco often tests the misconception that a properly mapped LUN and associated service profile guarantee SAN boot success, leading candidates to overlook the physical or Layer 2 connectivity between the Fabric Interconnect and the SAN switches.
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
✓
Verify that the UCS Fabric Interconnect is connected to the SAN switches
Since the service profile is associated, the boot policy is set to SAN Boot, and the LUN is properly mapped to the WWPN, the most likely cause is a physical or Layer 2 connectivity issue between the UCS Fabric Interconnect and the SAN switches. Without this link, the fabric interconnect cannot forward FCP frames to the storage array, preventing the blade from discovering the boot LUN. Verifying this connection is the logical first step before investigating other configuration or zoning issues.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Verify that the UCS Fabric Interconnect is connected to the SAN switches
Why this is correct
Without fabric connectivity, the server cannot reach the storage.
- ✗
Reboot the chassis to reinitialize the IOM
Why it's wrong here
Rebooting chassis is unnecessary and disruptive.
- ✗
Check that the vHBA has a dynamic WWPN assigned
Why it's wrong here
Dynamic WWPNs are fine; the issue is connectivity.
- ✗
Ensure the local disk is set as primary boot device
Why it's wrong here
SAN boot bypasses local disk.
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