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SSD vs SATA for surveillance station?

#1
Thank you so much for your fantastic review of the DVA 3221. It is by far the best review of its capabilities I have found. I have a DS920+ and started using surveillance station with three 6GB WD Red drives in RAID 5. I liked the interface and setup but playing anything back was a very slow process and I even switched to blue iris software for a while because of it. I upgraded the RAM and added two NVME drives but it was still painfully slow. I’m going to buy this DVA3221 through your link and upgrade the RAM but I’m trying to decide if I get the Synology SSDs or just buy similar WD Red drives. Cost isn’t much of a consideration. Will it make a big difference in playback/scrubbing to have SSDs?
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#2
Synology DVA3221 comes with a PCIe graphics card inside. This allows this system to detect people. This makes smart surveillance possible. You will also be streaming footage via LAN either way. So performance-wise it should work similarly to DS920+. Using internal SSD instead of HDDs would speed up the IOPS. It would be much quicker and smoother to access the files including surveillance.I would recommend to check system resource monitor on your NAS and pinpoint where is the slowest link this chain. Maybe you are recording 4K and your monitor, Wifi or PC needs transcoding to display the footage. But SSD would certainly speed things up either way (not NVMe cache).I hope this helps.
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