This makes sense. 
fmdump -eV reported that your original drive was experiencing repeated 
fread failures ( scsi command code 0x28) 


----- Original Message -----
Well, I decided to bite the bullet and kick the original 
disk from the pool after replacing it with the spare, and 
to say the least, speed prognosis looks a lot better now, 
about two times better in zpool's resilver progress/estimate 
and by up to an order of magnitude better at iostat speeds: 
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