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+--- Thread: DS1821+ Fan Question (/showthread.php?tid=12479)
DS1821+ Fan Question - Enquiries - 11-14-2025
I have a Synology DS1821+ with 2 WD Red NVMEs and 8 WD red SA500 4TB drives. When copying large (500GB plus data) from one volume to another and SSDs heat up which is expected but I get a Synology message stating system temperature is high and NAS will shutdown. This is because the SSD will go up to 60 degrees Celsius. I know the fans are setup to exhaust air but was wondering if it would be better to switch them to intakes? This way the drives and system overall remain cool?
RE: DS1821+ Fan Question - ed - 11-14-2025
You can try reversing the fans as a test since there is nothing to lose, and in some setups it can shift airflow enough to help. Just keep an eye on overall system temps after you switch them. In most cases the bigger improvement comes from adding proper heatsinks to the NVMe drives, since the DS1821+ does not cool SSDs very well during long internal transfers.
If you combine NVMe heatsinks with a higher fan profile during heavy copies, you should see far more stable temperatures without triggering shutdown warnings.