Monitoring Temp and Fan Speed in a Quanta LB4M switch

I’m starting to replace the fans in my LB4M to try to quiet it down. During this process I wanted to keep an eye on my temp and the associated fan speeds to make sure I wasn’t running into a problem with cooling. Here’s my Telegraf code with the applicable OIDs.

[[inputs.snmp]]
agents = [ “192.168.1.1:161” ]
timeout = “5s”
retries = 3
version = 2
community = “something”
max_repetitions = 10
name = “QuantaSwitch”
[[inputs.snmp.field]]
name = “Temp”
oid = “1.3.6.1.4.1.4413.1.1.43.1.8.1.4.0”
[[inputs.snmp.field]]
name = “Fan Speed 1”
oid = “1.3.6.1.4.1.4413.1.1.43.1.6.1.4.0”
[[inputs.snmp.field]]
name = “Fan Speed 2”
oid = “1.3.6.1.4.1.4413.1.1.43.1.6.1.4.1”
[[inputs.snmp.field]]
name = “Fan Speed 3”
oid = “1.3.6.1.4.1.4413.1.1.43.1.6.1.4.2”

I started with pulling all 3 original fans and only installing two of the Noctua fans. The temp went from 40c to 60c before I shut it down. The Noctuas were also starting to run pretty fast. I’ve reconnected one of the original fans and now the temp is around 48c. I’m not sure if this is because the Noctuas are less efficient or if having the mixed fans is causing them to be confused about the speed. I’ll get a third Noctua soon and report my results.

The fan tray just slides out the back, so no need to open up the case. It’s super easy. This is the fan I used, and it’s a straight fit: https://www.amazon.com/gp/product/B071W93333/ref=ppx_yo_dt_b_asin_title_o00_s01?ie=UTF8&psc=1