Hi, I just installed ZFS root mirror with Current with 4k sector drives before I saw your article. Before I tear down my setup is the performance much improved over 512 sector sizes. Thanks for your posting. Great info
output from diskinfo:/dev/ada0
512 # sectorsize
2000398934016 # mediasize in bytes (1.8T)
3907029168 # mediasize in sectors
4096 # stripesize
0 # stripeoffset
3876021 # Cylinders according to firmware.
16 # Heads according to firmware.
63 # Sectors according to firmware.
5YD2LLPS # Disk ident.