david279

I think the command for rolling back to a snapshot is zfs rollback snapshot, its as simple as that. The zfs master plugin also allows you to rollback using a snapshot.

Sounds like this
 
https://forums.unraid.net/bug-reports/stable-releases/612-unraid-webui-stop-responding-then-nginx-crash-r2451/?tab=comments

Raidz uses a portion on each disk for parity. So a bit under 4 TB is about what's expected. You lose the capacity of a whole disk with raidz1 and you lose the capacity of 2 disk with raidz2. 

When I hover over the percentage it's tells me how many GBs are in use. 
ZFS arc cache. It's 1/8 of the total amount of RAM in your system. Normally ZFS will use all your ram but they limited it so it's not as aggressive. Hovering over all those bars gives a numeric value. 
 
 

Pools originating from truenas aren't able to be imported right now. They explained the reasoning in the 6.12 release notes. Compatibility supposed to be coming in the later releases. 

You may have to pass through a usb controller so you can directly connect the mouse. Something about high polling seems to throw the VMs latency way up. I had it happen with logitech and a roccat mouse.