Richard already addressed this process, but I do this basic concept all the 
time (moving to a larger disk or new computer).  I simply create the partition 
on the new disk with format, then "zpool attach -f" the larger drive.  Once 
done mirroring, use installgrub as normal.  Remove the smaller drive and you're 
done.  You get the new, larger capacity in my experience.  I've done this 
several times without an issue.

This is a bit of an abbreviation, but don't overthink it.

I've also used this to migrate to a new computer with larger disks.  The only 
caveat I've run into is you need to move from SATA/AHCI to the same, or 
SATA/IDE to the same.  They can be different controllers, but for me they have 
to match their AHCI mode.  I'm sure someone has a method to address that issue.
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