How to clear disk errors? Should I wipe and start over?

TrueNAS General
3

Take a look at my Drive Troubleshooting Flowcharts linked below in my signature. It covers some of the very frequent ZFS issues like what you are dealing with. It is a simple flowchart and if you have some difficulty understanding what is being asked, post a question. But give this a try, learning how to fix things faster, and you understand more of what is going on.