The motherboard is too new, and hence too expensive for what it is (PCIe 5.0? no use for that in a NAS). And the last generation Core i9 is way too powerful for what a NAS requires; unless you plan to run CPU-intensive VMs/apps, this is massive overkill.
For a storage plateform with light apps, and with a 600 E budget "for the motherboard", you could have an
A2SDi-H-TF instead. Except this one already includes the CPU, 12 SATA ports and a server-grade 10 GbE NIC—and, if you buy second-hand RAM, you can fit it with 128 GB for 120 E (RDIMMs are GREAT).
If you do need an iGPU for transcoding, the recommendation would be an earlier generation: C2x6 chipset and Xeon E-2000,
or even a Core i3-8100/9100 going back to Coffee Lake. Less sexy, but powerful enough for a NAS and hopefully lighter on your wallet (although C246 motherboards are now hard to find and so more expensive than they should and than they used to be).
Edit. The above began as generic recommendation. Then I went back up and remembered you want 16*20 TB… 320 TB before taking out redundancy. At these heights, the "1 GB RAM per TB of storage" does not apply strictly, but 128 GB RAM feels like a bare minimum. On UDIMM platforms, a L2ARC would help; on RDIMM platforms, consider 192-256 GB RAM.
You're in a territory where a 1st (or 2nd) generation Xeon Scalable would be quite a reasonable option—put a GPU for transcoding, or just handle that on the CPU.
Urgh! I more or less feared the Aquantia NIC (
dubious driver support in TrueNAS; server-grade Chelsio T520 or Solarflare 5122F/6122F/7122F cards go for $50 on eBay) but the "SATA card"… HOLY CRAP! 16 ports on a 4-port controller (
ASM 1064, PCIe 3.0x1) and
multiple port multipliers…
Do NOT use that with ZFS! This is litterally guaranteed to destroy your data. Get a SAS HBA instead (LSI 9200/9300 series, or the Dell/HP/IBM equivalents).
Beside, with so many drives, a server enclosure with hot-swap trays on a SAS backplane would make your life easier than cramming 16 drives in a consumer-grade ATX tower (Define 7XL or the like?).
With the introduction of SAS 12Gbps, seems like "it's time" to do a braindump on SAS. Work in progress, as usual. History By the late '90's, SCSI and PATA were the dominant technologies to attach disks. Both were parallel bus multiple drop...
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