Does TrueNAS support using a virtual disk in a storage pool? (lemmy.ca)

submitted 2 weeks ago by SethranKada@lemmy.ca to c/techsupport@lemmy.world

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I recently purchased a new NAS / Server and while I'm waiting for it to arrive I'm planning out my storage and RAID configurations.

I'ce mostly decided on using 5 20TB or 24TB drives in RAID z2 as my primary storage pool. I'll just use a 500GB nvme as a read cache. But I still have a gen 4 by 4 nvme slot available, and I'm considering buying a stupidly large nvme drive to put in it.

Problem is, I want some fault tolerance, so I'm wondering if I can just make a virtual drive in my primary pool and use a RAID mirror between the nvme and the virtual drive to make my secondary pool.

Would this work? Or would the performance overhead and instibility make this a fool's errand?

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[-] SethranKada@lemmy.ca 3 points 2 weeks ago

Thanks for the info! I didn't realize that ZFS already does caching. I guess I'll use those two nvme slots for two identical drives for my secondary pool then.

this post was submitted on 27 Jul 2025

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