ZFS fast scrub
NEVER DO THIS!!!
If you need a fast scrub to get to production state after an bloody hard unplanned downtime... and so on... I would expect you to not to do this.
But it worked for me:
# echo "zfs_scrub_delay/D" | mdb -k zfs_scrub_delay: zfs_scrub_delay:4 # echo "zfs_scrub_delay/W0" | mdb -kw zfs_scrub_delay:0x4 = 0x0
This sets the scrub delay to zero... your system will do a lot of scrubbing and not so much other things.
Remember to set it back to the old value later (4 in this example)!
# echo "zfs_scrub_delay/W4" | mdb -kw zfs_scrub_delay:0x0 = 0x4
But remember I told you: NEVER DO THIS!!!