What are you asking for?
You need to know that ZFS scrub checks the integrity of the data, while auto-verify (I guess), will check the integrity of the raid.
gmirror status should give you the status of your mirror, but it can‘t check data integrity of a UFS filesystem if you expected that. UFS has no mechanism to verify data integrity.
Mo matter what filesystem you use, the smartmontools port is handy to check your drives SMART status and run self tests on them.
(sorry for missing formatting, I‘m on phone)