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.