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These posts are super helpful; many thanks to those who shared their insight on this conifguration. One clarifying question: has anyone figured out whether it is possible to have the UGreen NAS automatically reboot once mains power has been restored to the UGreen UPS? Graceful shutdown works properly with the configuration posted above. Many thanks.

And, I suppose, alternatively, if I should take the pool route and select the "none" option for array in Beta-2, and I create a pool with raid-z1, what would be the limitation if I elect to add a fourth NVME to the storage pool at a later date? If I did so, it would be a NVME matching the three currently in line (e.g., 4TB).

As I have been going further down the reading rabbit hole, the concern I am zeroing in on the issue of the NVME controller (in my case, Samsung 990 Pro) running trim functions independently, and this causing issues for the parity process in the array. Am I thinking about this correctly? Grateful for your insights.

And one additional question: do you have any insight on possible TRIM-related concerns with having the all-NVME array? Again, thank you.

Super helpful, thank you. My intuition is that given the expected level of usage (e.g., demand on the drives) and the general performance benefit of NVME, that the ease of expansion and free-standing nvme recovery benefits of the Unraid array path is of greater value than the performance pickup in raidz. Does this sound right?

@JorgeB Many thanks. Perhaps I could add a follow-up question: How would you weigh the relative merits of creating a single array (two data, one parity) vs. creating a raidz zfs pool?

New here, and my apologies if this has been addressed elsewhere definitively, but I am at a loss after quite a bit of research. Am configuring a clean install of Unraid 7.0.0 beta-2 on a UGreen DXP480T Plus NAS, which is all NVME storage. Presently, of the four NVME slots, three are in use (all 4TB). I am looking for guidance on best practices for configuration/utilization of these NVME disks. Given that this is all NVME, I am wondering about the necessity of creating a cache. I believe, from what I have been reading, that Unraid 7 (possibly) presents a new path forward in this regard, and that some of what I have read about disk allocation (particularly with respect to all NVME configurations) in prior Unraid versions may no longer hold. Would be most grateful for input on best practices for how to approach configuration of this clean install of unraid 7.0.0 beta-2. Many thanks.