Question 161 of 144
SK0-005 troubleshooting Practice Question
A server experienced an unexpected power loss. After power is restored, the server boots successfully, but several critical services fail to start automatically. The administrator checks the system logs and finds errors indicating missing LUNs from a SAN. The SAN administrator confirms the SAN is online and the LUNs are assigned to the server's WWNs. The server uses FC HBAs. Which TWO steps should the administrator perform to diagnose the issue?
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
✓
Rescan the SCSI bus on the server.
Options A and C are correct. After an unexpected power loss, the SAN topology or host's view of LUNs may be stale. Rescanning the SCSI bus forces the host to re-discover all accessible LUNs. Checking FC switch zoning ensures that the path between the host and storage is still correctly allowed after the power event. Option B is unnecessary and disruptive, as the SAN is confirmed online. Option D is premature. Option E is unrelated to sudden LUN disappearance after power restoration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Rescan the SCSI bus on the server.
Why this is correct
A rescan will refresh the server's list of visible LUNs and may re-establish connections that were lost during the power cycle.
- ✓
Check the FC switch zoning configuration.
Why this is correct
Power loss can sometimes cause switches to revert to saved or incorrect zoning, so verifying that the correct zones are active is a critical diagnostic step.
- ✗
Replace the FC HBAs.
Why it's wrong here
There is no evidence of HBA hardware failure; replacement should only be considered after thoroughly ruling out configuration and connectivity issues.
- ✗
Reboot the SAN controller.
Why it's wrong here
The SAN is confirmed online; rebooting its controllers would cause unnecessary downtime and does not address the server-side discovery issue.
- ✗
Reinstall the multipathing driver.
Why it's wrong here
Multipathing software is unlikely to be the cause of LUNs disappearing entirely after a power event, and reinstallation is an excessive action at this stage.
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Last reviewed: Jul 26, 2026
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