I built a Synology clone (kinda like hackintosh for Synology).
I started off with an 8 bay case and switched to 12 bays while reusing the same internal hardware this year to run a second array because I wanted to reuse the 3.5" drives I pulled from my hackintosh with my Mac Studio. The motherboard I am using has 12 built-in SATA ports so it worked out perfectly.
I love the Synology DSM and SHR/SHR2. DSM is super user friendly and easy to use. SHR/SHR2 allows me to mix n match drives of different capacities and easily upgrade the capacity of the arrays just by swapping out smaller capacity drives with larger ones. These two features are what I loved about the Drobos.
Since I use 10GBase-T, performance of my NAS is fantastic and several magnitudes faster than my old Drobos. The time it takes to upgrade the capacity of an array is also much faster.
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In terms of reliability, Synology DSM itself has been rock solid. I did have a problem with my hardware because of an Intel flaw on the SoC that's used on my motherboard. Luckily, I was able to return the motherboard to AsRock and they replaced it with a board that has an SoC with a fix. Other than that, I haven't had any downtime in the six years this NAS has been in service.
We take stock of the Intel Atom C2000 series bug and what vendors are doing about it. We are clearly seeing evidence of effective NDAs