JBOD chassis control fans

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Nnyan

Active Member
Mar 5, 2012
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Sacramento CA
Been consolidating into 36-45 drive JBODs. I have been running them using the CSE-PTJBOD-CB2 powerboards. The biggest issue I have is the noise of the fans. Since there is no motherboard on these units there is no IPMI I can use to lower the fan speed. I tried the Noctua speed reduction cables and they worked REALLY well (the 7 fans in the unit i tested on were VERY quiet). BUT the issue is that these overheat VERY fast. Less than 1 minute and they are too hot to touch so I didn't run them longer. Got this based on a recommendation I saw on line (https://www.amazon.com/dp/B09NLV3LRK?psc=1&ref=ppx_yo2ov_dt_b_product_details) but the speed control did not work.

Another cryptic post mentioned controlling a JBOD via the SAS connection via "SES" but I'm only just starting to look at that rabbit hole and I did find this: https://www.reddit.com/r/homelab/comments/49ba2d
Anyway just wanted to see how people are managing the fan speeds/noise on their Supermicro JBODS.

Thanks!




SCSI Enclosure Services - Wikipedia

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gb00s

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Jul 25, 2018
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Old or broken 10-30USD Supermicro X9/X10 boards w/IPMI still functioning. Yes, adds additional 7-10W but has benefits.
 
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mattventura

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Nov 9, 2022
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The SES method only has a chance of working if the fans are in some way connected to the SAS expander itself, like if the backplane has fan headers. Some older ones (usually 6g SAS) do. But as said, your best bet is probably to either replace the fans or whole fan wall, or get the absolute cheapest board with IPMI-controlled fans that you can find.
 
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Nnyan

Active Member
Mar 5, 2012
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gb00s said:
Old or broken 10-30USD Supermicro X9/X10 boards w/IPMI still functioning. Yes, adds additional 7-10W but has benefits.
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That is basically what I was leaning towards. I just wasn't 100% sure if the IPMI would work on all boards without CPU/RAM/HD. I found MBD-X10SLL-F for $30 which is better then the powerboards but like you said with more power use. Just ordered one in case I need it for that price it's a throwaway.
 
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Nnyan

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Mar 5, 2012
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should have done my research first those NA-RC7s are rated at 2.5w max and the FAN-0158L4's are typically at 11.28w., it's a wonder I didn't start a camp fire.
 
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Markess

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May 19, 2018
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Nnyan said:
should have done my research first those NA-RC7s are rated at 2.5w max and the FAN-0158L4's are typically at 11.28w., it's a wonder I didn't start a camp fire.
Click to expand...
Edit: Oh, says right there that you have RC7s. Guess I'm not paying attention very well today.

Plus, there's different model reducers. I'd assume that the ones with lower resistance values can probably handle more wattage without getting hot than the higher resistance ones? Do you know which ones you have?

NA-RC6: 81.4 Ω
NA-RC7: 50 Ω
NA-RC8: 150 Ω
NA-RC9: 100 Ω
NA-RC10 - 51 Ω (3-Pin)
NA-RC11 - 98 Ω
NA-RC12 - 147.5 Ω (3-Pin)
NA-RC13 - 82 Ω (3-Pin)
NA-RC14 - 27 Ω
NA-RC15 - 27 Ω (3-Pin)

I make no guarantees that this is a complete list and there may be more of these that are 3 Pin, I'm not sure on all of them.
 
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alee0904

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Feb 15, 2025
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I have a 45 bay. Did you end up ordering an older Supermicro board? if so, what board? And does it work without CPU/MEM/HD?
 
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