CompTIA Server+ (SK0-005)Server Hardware Installation and ManagementMedium
A server administrator needs to replace a failed power supply unit (PSU) in a production server. The server is equipped with redundant, hot-swappable PSUs. Which of the following is the MOST important safety precaution to take before physically removing the failed PSU?
- AVerify that the remaining PSU is fully functional and providing power.
- BGround yourself with an anti-static wrist strap.
- CEnsure the server is completely powered off and unplugged.
- DNotify all users that the server will experience a brief outage.
Show answer & explanationAnswer & explanation
Correct answer: A. Verify that the remaining PSU is fully functional and providing power.
Before removing a hot-swappable redundant PSU, it is critical to verify the operational status of the other PSU to ensure the server maintains uninterrupted power. Removing a PSU while the remaining one is also failed or not fully functional would cause the server to crash.
Why the other options are wrong
- B. An anti-static wrist strap is general ESD safety, but verifying power redundancy is more critical for hot-swap operations.
- C. The scenario specifies 'hot-swappable' PSUs, meaning the server should remain powered on.
- D. While good practice, notifying users is not the MOST important safety precaution related to the physical removal of a hot-swappable PSU.
Hot-Swappable PSU Replacement
The process of replacing a power supply unit in a server while the server remains powered on and operational, relying on redundant power sources.
- Requires redundant PSUs (N+1 or N+N).
- Primary goal is to maintain server uptime.
- Crucial to verify remaining PSU functionality before removal.
Memory trick: Before you 'swap', make sure the 'other' one is 'running'!