Hi all !



My client have encountered a strange behaviour on some of its Nutanix-Dell Blocks and i'd like to share the resolution on this.



Thanks to Nutanix / Dell support team for their 'patience' with IT team on this false-positive critical alert resolution.



context :

Multiple critical alert Seen on PRISM : FAN SPEED LOW for a whole cluster (this mean all FANS on ALL blocks).

No alerts detected on IPMI / IDRAC and VIclient (directly on ESXi for HW messaging).

HW: DELL XC 630-10

SW : NOS 4.6.4

HV : ESX 6.0 u2



Resolution :

This is a false positive message which occurs when NOS cannot correctly interpret IPMI messaging due to a miconfig on a /etc/nutanix/hardware_config.json.



the sensor of type "fans : rpm" has a misconfig on its adress.



GOOD adress is "ipmi_sensor:FAN"

BAD adress is "ipmi_sensor:FAN RPM"



resolution will be to modify this descriptor for each FAN (14 on a XC630-10 model) on each host.



If you encounter this kind of issue, please contact NUTANIX / DELL support, they will give you a py script that will modify all json on all node or modify it by yourself (and do it at your own risk 😉. Last possibility, upgrade yoru cluster for a 5.x / 4.7.x version.



best regards,



Thomas