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After couple failed hard disks in my old NVR, I’ve come to realize heat is the biggest enemy of hard disks. The NVR had to provide power to the POE cameras, ran
by ww520 2y ago
After couple failed hard disks in my old NVR, I’ve come to realize heat is the biggest enemy of hard disks. The NVR had to provide power to the POE cameras, ran video transcoding, and constantly writing to the disk. It generated a lot of heat. The disks were probably warped due to the heat and the disk heads crashed onto the surface, causing data loss.
For my new NVR, the POE power supply is separated out to a powered switch, the newer CPU can do hardware video encoding, and I used SSD for first stage writing and hard disks as secondary backup. The heat has gone way down. So far things have run well. I know constant rewriting on SSD is bad, but the MTBF of SSD indicates it will be a number of years before failing. It’s an acceptable risk.
- walrus01 2y agoThat seems like a very poor chassis design on the part of the NVR manufacturer. The average modern 3.5" high capacity HDD doesn't generate that much heat. Even 'datacenter' HGST drives average around 5.5W and will top out at 7.8W TDP under maximum stress. Designing a case that uses relatively low rpm, quiet, 120 or 140mm 12VDC fans to pull air through it and cool six or eight hard drives isn't that difficult. In a midtower desktop PC case set up as a NAS with a low wattage CPU, used as a NAS, a single 140mm fan at the rear sucking air from front-to-back is often quite enough to cool eight 3.5" HDD. But equipment designers keep trying to stuff things into spaces that are too small and use inadequate ventilation.
- ww520 2y agoIn a combination of heat, the POE cameras draw quite a bit of power, the video transcoding, and then the constant disk writes, all in a small slim case. It ran very hot during summer.