Chassis alarms of FANs not spinning might be seen on QFX5100-96S device. root@QFX5100-96s> show chassis alarms no-forwarding 3 alarms currently active Alarm time Class Description 2021-01-25 10:49:15 UTC Major FPC 1 Fan 0 not spinning 2021-01-25 10:48:05 UTC Major FPC 1 Fan 2 not spinning 2021-01-25 10:48:05 UTC Major FPC 1 Fan 1 not spinning
Within the syslog messages, the chassis alarms of FPC fan not spinning may appear repeatedly at major level as both alarm set and alarm cleared notifications.
Jan 25 16:09:22 2021 qfx5100-96s craftd[2101]: Major alarm set, FPC 1 Fan 0 not spinning
Jan 25 16:28:32 2021 qfx5100-96s craftd[2101]: Major alarm cleared, FPC 1 Fan 1 not spinning
Jan 25 16:28:32 2021 qfx5100-96s craftd[2101]: Major alarm cleared, FPC 1 Fan 2 not spinning
Jan 25 16:29:32 2021 qfx5100-96s craftd[2101]: Major alarm set, FPC 1 Fan 1 not spinning
Jan 25 16:29:32 2021 qfx5100-96s craftd[2101]: Major alarm set, FPC 1 Fan 2 not spinning
Jan 25 16:29:42 2021 qfx5100-96s craftd[2101]: Major alarm cleared, FPC 1 Fan 0 not spinning
Jan 25 16:30:42 2021 qfx5100-96s craftd[2101]: Major alarm set, FPC 1 Fan 0 not spinning
Jan 25 16:49:52 2021 qfx5100-96s craftd[2101]: Major alarm cleared, FPC 1 Fan 1 not spinning
Jan 25 16:49:53 2021 qfx5100-96s craftd[2101]: Major alarm cleared, FPC 1 Fan 2 not spinning
Jan 25 16:50:53 2021 qfx5100-96s craftd[2101]: Major alarm set, FPC 1 Fan 1 not spinning
Jan 25 16:50:53 2021 qfx5100-96s craftd[2101]: Major alarm set, FPC 1 Fan 2 not spinning
Jan 25 16:51:03 2021 qfx5100-96s craftd[2101]: Major alarm cleared, FPC 1 Fan 0 not spinning
Jan 25 16:52:03 2021 qfx5100-96s craftd[2101]: Major alarm set, FPC 1 Fan 0 not spinning
The issue arises from an incorrectly programmed fan RPM setting in the QFX5100-96S platform due to a known software defect in Juniper (PR1570587). As a result, the system generates erroneous chassis alarms and corresponding syslog messages that indicate the fans are not spinning, despite the fan functioning correctly. It is important to note that these alarms are merely cosmetic in nature and do not indicate any actual hardware malfunction.
version 0.1 - by Peter Zhang
https://prsearch.juniper.net/problemreport/PR1570587