Fetching IPMI sensor data hangs a lot

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1

Hi everyone,

Did someone else encountered this issue after the latest updates ?

Since latest updates when changes were done at IPMI level, LibreNMS started to work very hard, spiking the CPU very often above 70%. Polling time increased for each Dell Device that has IPMI enabled.

Tried to work with the values from the IPMI Settings, but nothing works.

On this execution:

Fetching IPMI sensor data…SNMP[‘/usr/bin/ipmitool’ ‘-H’ ‘HOSTNAME’ ‘-U’ ‘USER’ ‘-P’ ‘PASSWORD’ ‘-L’ ‘USER’ ‘-p’ ‘623’ ‘-N’ ‘3’ ‘-I’ ‘lanplus’ ‘-c’ ‘COMMUNITY’]

it hangs quite a lot of time and I’m assuming is the cause of the problem.

Thank you!

2

These are the seconds of the polling with IPMI enabled:

device1 2025-11-26 10:13:03 General Unknown 178.59
device2 2025-11-26 10:12:27 General Unknown 143.19
device3 2025-11-26 10:13:44 General Unknown (edit /etc/snmp/snmpd.conf) 16.93
device4 2025-11-26 10:14:00 General Unknown (edit /etc/snmp/snmpd.conf) 16.59

All 4 devices are Dell R630 with iDrac 8, Lifecycle Firmware Version 2.86.86.86.

3

Did you try to run snmpwalk pointed at one of the affected machines to see if it shows you anything weird?

4

I’ve done a manual ipmitool command on both iDrac8 and iDrac9:

iDRAC8: time ipmitool -I lanplus -C 3 -H 192.168.1.1 -U test -P test sdr list
real 2m34.308s
user 0m0.156s
sys 0m0.105s

iDRAC9: time ipmitool -I lanplus -C 3 -H 192.168.1.12 -U test -P test sdr list
real 2m53.269s
user 0m0.193s
sys 0m0.151s

So, it’s hard to believe both are broken. It’s the way it works, IPMI is slow.

What I want to understand is what changed and if there is a fix.

Thank you!

5

Hi,

All Dells are affected. It’s not something isolated.

I’m not seeing anything out of the normality. With IPMI disabled, everything runs relatively fast.

What do you mean by weird ?

6

So your manual test of just running ipmitool is taking between 2 and 3 minutes. If that’s how slow the call is then we can’t speed that up.

7

Than, what’s the explanation that before latest updates on the IPMI side, never got this issue ? what actually changed ?

I understand it takes 2-3 minutes, all 30+ Dells in the monitoring have that time, iDrac8 or 9. It makes me think that’s their implementation.

It might help me to understand if it’s truly a problem on my side, if others could help with some values on the response time.

Thank you!

8

On SuperMicro servers there was similar problem with IPMI

  • on one X11 helps disable HR Module ( Librenems > Device > Edit > Module > toggle HR).
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