> #1 is speed. You can aggregate 4x1Gbit ethernet and still not touch 4Gb/sec 
> FC. 
> #2 drop in compatibility. I'm sure people would love to drop this into an 
> existing SAN

#2 is the key for me. And I also have a #3:

  FC has been around a long time now. The HBAs and Switches are (more or less 
:-) debugged and we know how things work...

iSCSI - well, perhaps. But to me that feels like it gets "too far away" from 
the hardware. I'd like to keep the "distance" between the disks and ZFS as 
short as possible.

Ie:
ZFS -> HBA -> FC Switch -> JBOD -> "Simple" FC-SATA-converter -> SATA disk
 
 
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