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Optimal Drive Configuration and Cache Setup for TrueNAS running media server and personal files

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I'm new to TrueNAS and seeking advice on the optimal setup for my system.

I've built my system with the following specifications:

  • AMD Ryzen 5 3400G CPU
  • 16GB RAM
  • 3x 3TB WD Red (I can install an additional 3TB WD Red drive in the future)
  • 2x 2TB WD Red,
  • 512GB m.2. SSD for TrueNAS.

My goal is to host personal files and a media collection for Jellyfin/Plex. Redundancy is crucial for personal files (I want to maximize this redundancy), but less so for the media collection since I always have physical copies of this.

What is the best way to configure my drives? My current idea is to use the three 3TB drives in a RAIDZ1 setup and host all my files on these drives (if I get a fourth 3TB drive, I might make this RAIDZ2), and use the 2TB drives in a mirror configuration to which I make a daily backup of my personal files.

I'm also considering an additional SSD on which I install TrueNAS, so that I can repurpose the m.2. SSD as cache (L2ARC) for the 3x3TB pool, is this a good idea?

Any insights appreciated, including other suggestions.

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