Rebooting and I have no idea why

[SmallBarky]

I doubt you need L2ARC with 128 GB of RAM and your usage. Mirroring the HDs for slower and larger data storage and mirroring the SSDs for aps and VMs is probably the best choice. What are you using for the boot drive?

BASICS

ZFS Primer

iX Systems pool layout whitepaper
https://www.truenas.com/solution-guides/#TrueNAS-PDF-zfs-storage-pool-layout/11/
Special VDEV (sVDEV) Planning, Sizing, and Considerations

Special VDEV (sVDEV) Planning, Sizing, and Considerations

This resource was originally sourced from a Suggestion thread here: https://forums.truenas.com/t/suggestion-better-svdev-planning-oversight-tools-in-gui/394/ Why consider a sVDEV? A sVDEV has the potential to significantly speed up the operations of a spinning hard-drive (HDD) pool. One of it’s functions is to hold metadata (ZFS produces a lot of it). The other function is to make small blocks available for file storage. These small blocks are supposed to store data that is smaller than a cut…