Which symptom may indicate a faulty power supply in a NetApp controller?

A faulty power supply unit (PSU) in a NetApp controller will immediately trigger hardware environmental alerts within the ONTAP system. The Service Processor (SP) or Baseboard Management Controller (BMC) continuously monitors physical hardware components, including temperatures, voltage levels, cooling fans, and power supplies. When a PSU fails, loses power, or operates outside normal parameters, the system generates specific environmental AutoSupport messages and Event Management System (EMS) alerts. Administrators can view these alerts using the system node environment sensors show command to pinpoint the exact hardware failure. Promptly addressing these environmental alerts is critical to maintaining system high availability and preventing unexpected controller shutdowns during subsequent power events.

A. An additional S3 bucket appears: This is a logical storage provisioning event, completely unrelated to physical hardware failures.

B. NFS clients use TCP: TCP is the standard and expected transport protocol for modern NFS traffic, not an error symptom.

C. A LUN is mapped: LUN mapping is a standard administrative task to grant SAN hosts access to storage, not a hardware fault indicator.

1. NetApp ONTAP 9 System Administration Reference, Section: "Monitoring hardware using environmental sensors".

2. NetApp ONTAP 9 EMS Event Catalog, Section: "Power supply failure events and AutoSupport triggers".