Troubleshooting high fan speed in T-series systems

(Doc ID 2208651.1)

Last updated on JUNE 05, 2018

Applies to:

SPARC T3-1 - Version All Versions and later
SPARC T3-2 - Version All Versions and later
SPARC S7-2 - Version All Versions and later
SPARC T8-4 - Version All Versions and later
SPARC T8-2 - Version All Versions and later
Information in this document applies to any platform.

Symptoms

All fans of a T-series server spin at the maximum speed.  This can be seen via Snapshot file:

ipmi/@usr@local@bin@ipmiint_sensor_list.out
FBD0/FM0/TACH | 10624.000 | RPM | ok | 3968.000 | na | na | na | na | na
FBD0/FM1/TACH | 10624.000 | RPM | ok | 3968.000 | na | na | na | na | na
FBD0/FM2/TACH | 10624.000 | RPM | ok | 3968.000 | na | na | na | na | na
FBD0/FM3/TACH | 10496.000 | RPM | ok | 3968.000 | na | na | na | na | na
FBD0/FM4/TACH | 10496.000 | RPM | ok | 3968.000 | na | na | na | na | na
FBD1/FM0/TACH | 10368.000 | RPM | ok | 3968.000 | na | na | na | na | na
FBD1/FM1/TACH | 10624.000 | RPM | ok | 3968.000 | na | na | na | na | na
FBD1/FM2/TACH | 10496.000 | RPM | ok | 3968.000 | na | na | na | na | na
FBD1/FM3/TACH | 10496.000 | RPM | ok | 3968.000 | na | na | na | na | na
FBD1/FM4/TACH | 10368.000 | RPM | ok | 3968.000 | na | na | na | na | na

Fans typically spin at 5000 RPMs for most systems, but can spin at 10,000 RPM when max cooling is needed.
Fans of 1 RU high systems (like the SPARC S7-2) will typically spin at 8000RPMs & have a high rate near 19,000 RPM.

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms