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/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)!

But remember I told you: NEVER DO THIS!!!