zpool status
to se the status and health of the ZFS pools.smartctl -a /dev/sdX
if you want to get detailed health information of drive "sdX" or smartctl -t short /dev/sdX
to initialize a short self test of the drive "sdX".Ok, that makes sense. If you use HW raid with a raid1 array both disks are presented ZFS as a single disk. One drive might still be failing but ZFS can't see this because its hidden behind the abstraction of the raid controller.You have a hardware raid
Here is the explanation why its bad: https://openzfs.github.io/openzfs-docs/Performance and Tuning/Hardware.html#hardware-raid-controllersBTW zfs on a hardware raid controller is a bad idea.