Can I run my TrueNAS apps off of just one NVMe? Or should I really mirror them?

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Building my first TrueNAS and was going to get 1 x open box / used 1.92TB Samsung PM9A3 NVMe, to run my apps off of.

Questions:

1. Should I really mirror my app NVMe’s, and get two?

2. How big capacity NVMe should I get, based on my uses? (Shown below)

The apps I would run:

  • Immich (I have like 2 - 4TB of photos, and a few TB of videos. I will be doing video editing)
  • Nextcloud
  • Jellyfin (Maybe will have a few hundred movies. I don’t watch many movies, just archive older / hard to find movies, for when I do watch them, maybe once a month).
  • Maybe a few other apps I haven’t though of yet

In my home ecosystem I will also be running:

  • a powerful desktop workstation
  • a homelab server (i7-8700T w/ 64GB RAM and 256gb + 1tb NVMe)
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Usually you would store photos and videos on mass storage like a spinning hard drive. Then you can use something cheaper like 1TB nvme for apps which is frankly very excessive. It’s a good use for sata ssd if you have them lying around, 95% of self hosted apps do not have significant i/o requirements.

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