> Before you do a dd test try first to do:
> echo zfs_vdev_max_pending/W0t1 | mdb -kw

I did actually try this about a month ago when I first made an attempt at 
figuring this out.  Changing the pending values did make some small difference, 
but even the best was far, far short of acceptable performance.

In other news, switching to zfs boot+root, in a ZFS-mirrored configuration, in 
passthrough mode, has made a huge difference.  Writing the 512M file took 15 
minutes before... I'm down to twelve seconds.
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