I’m a big fan of the Synology range of NAS devices. I have owned quite a few and recently had an issue with one of mine.
A fairly recent purchase was one of the DS923+ models however after about 6 months I have found the fans to start becoming noisy. Even though I run them with low power WD RED SSD’s so there is little or no heat AND have them using ‘quiet mode’ it was still noticable.
I can only guess that Synology have started using cheap components as this has never been an issue for me.
A quick search uncovered this thread https://nascompares.com/guide/synology-ds923-nas-noctua-fans-and-velcro-tutorial/ which seemed to recomend the Noctuna NF-A9 FLX fans. I puchased some, fitted and quickly realised they are totally unsuitable, so dont beleive all you read 🙂
Basically the power ratings are incorrect for what the Synology fan controller expects. The Synology ones are 0.12A, whereas the NF-A9 ones are 0.07A. If they are connected to the Synology, it thinks the fans have failed regardles of speed setting.
There was some discussion of using the pull-up resistors provided in the sets. This did not work for me and I didnt want to lash up my own lead with a 100ohm resistor inline. https://noctua.at/en/products/fan/nf-a9-flx
Also the NF-A9 ones have rubber mounts which do not allow them to be fitted correctly to the Synology. It makes the mounting bend due to them slightly being oversized. I ended up sending them back.
However, a bit more research and I found the perfect fit. The Nocuta NF-B9 redux 1600’s (see https://www.amazon.co.uk/dp/B0014I9K30) are a perfect like for like fit.
They are rated at 0.11A and fit perfectly. The cables are slightly long however a small cable tie sorted that. See https://noctua.at/en/nf-b9-redux-1600
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