Okay, this is special. A three-disk raidz with 14TB disks with 42TB of space? Maybe because it's a bhyve vm backed by sparse zvols? I mean... this isn't a thing, right?
zpool list -v db
NAME ...
now a raidz with 3 40TB disks claims to be 120TB? zpool is combining the disks like stripes. #headdesk