How do I get a vdev back online

Again if the USB attached disk has a non-unique serial number, the software could be getting confused and trying to use “both” paths to the device.

Run this command on all your disks and see if their are any duplicates with “/dev/sde”, your “GeneralStorage”;
smartctl -x /dev/sdX | grep -i serial
Replace “sdX” with each disk in sequence.