Welcome to the TrueNAS forums!
Question: What are you trying to gain when compared to the Synology you have running? I have a D-Link DNS-321, two drive small NAS, similar to your Synology. This was before I got into FreeNAS/TrueNAS. I wanted more throughput, I could only get 25Mb over my 1GbE. Very slow.
The WD Red drives, are they the older ones or newer ones? The old ones are CMR recording, the newer ones are SMR recording. SMR is not compatible with ZFS which is the file system used by TrueNAS. So if you have SMR drives, do not use them for this project.
My two cents are:
First of all, if you have the hardware then you can slap it together and test it out. Why not?
What I see:
8GB RAM is going to hit your performance. No need to even think 10GbE. You will not have a good sized ARC so you are starving for RAM. Also, SCALE does not use a SWAP partition so if you run out of RAM, your system fails to work. For this one reason, you might consider using CORE vice SCALE. I know CORE is going away, someday, but it uses a SWAP partition which would help fill in those low RAM gaps a little bit. If you want to run SCALE, you may need to purchase some more RAM, two 8GB sticks. I’ll bet used DDR2 RAM is cheap!
The number of drive ports is another issue. You should have a dedicated drive, not USB Flash Drive, as the boot drive. You can use a USB to SATA adapter for example, or USB to NVMe adapter, “IF” your motherboard will support booting from the USB drive. Possible options are:
- You purchase an HBA to put into that PCIe x16 slot. This would free up the two onboard SATA ports, one for the boot drive, and give you several ports from the HBA.
- Use the eSATA port for the boot drive and then you still have 2 internal ports for the Mirrored drives.
The CPU is okay, the lack of ECC RAM is okay, just do not expect any transcoding. A simple DLNA will place very little strain on your system. If you choose Plex, just enable DLNA and that is it. Do not use transcoding. Plex may not work smoothly, you will just need to see if you go down this road.
If you do look to purchase an HBA, realize that the HBAs recommended here the most do require a very high airflow rate to remain cool, or they fail. Another option that gets a bad name is a simple 4 port SATA adapter. This can have problems with CORE (FreeBSD) due to driver support, but some do work fine. I don’t know how well these are supported in SCALE(Linux Debian). It is a risk you may want to take.
Regardless, I do not see a “no purchase” way forward, while ensuring some reliability. Not unless you think outside the box. I am always willing to toss out options that many would not. One good option is to run an older version of TrueNAS or possibly FreeNAS, where you could run the system on a Flash Drive. If you are looking ONLY for DLNA and to saturate your 1GbE, that is doable. And no need to purchase anything new, except possibly your hard drives.
Whatever you do, run some stability tests, a MemTest86+ and Prime95 for example. If your hardware is not stable, your data would be at risk.