iostat -E should support blkdev devices
Currently iostat -E doesn't show anything for blkdev devices. This command is used to show device errors, capacity, and inquiry information.
The information shown by iostat -E is a pretty-printed kstat of class device_error. blkdev will have to create that kstat, and there needs to be a mechanism for drivers using blkdev to pass information about errors etc. to blkdev to be included in the kstat.