I have an Intel NUC NUC5i5RYK Mini PC 5th Gen i5 5250U 16gb 500gb m.2 single name card. I also have a 250gb name connected via usb. What recommendations do you have for raid given that I do not have space for SATA ssd. How can I use this box to experiment with truenas core? Any further upgrade recommendations welcome. BOOMEL
I would use SCALE, not CORE and if you can fit three drives into the gizmo, one boot, two data for a Mirror, then you would have something to play with. However keep in mind that unless it has ECC RAM, it does not meet the minimum spec requirement, but as a test bed, it would be fine. In fact you could also just create a single drive Stripe for that matter.
Suggest you read the User Guide for TrueNAS before getting too invested.
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IMHO, you can off course experiment TN just booting on USB, and with a single striped pool with your only disk. Why not, is a way to test (limited) things and for direct practice.
But i don’t see how test different pool layouts if you don’t have connection available for more than 1 disk.
Maybe, with some single SATA/USB adapter (cheap, 2~3€ each), and a couple of small cheap SSD… But we are far from raccomended setup
Most NUCs and SBCs, (Single Board Computers, aka like Raspberry Pis), are just not suitable for TrueNAS. In my opinion, not even for testing. Unless you want to test Apps or VMs.
For other testing, a VM on your normal desktop might be better. You can create half a dozen virtual drives to place with the GUI and different types of pool layouts. Some VM hypervisors won’t allow nested VMs, if that is desired, then yes, a NUC could be suitable for testing.
I’ve always like that mis-type sequence, Deer Snot 
Done it myself too, though most of the time I catch and correct.
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