examples/disk-zone-profile.fio

; Read disk in zones of 128m/2g, generating a plot of that afterwards
; should give a nice picture of the zoning of this drive

[global]
bs=64k
direct=1
rw=read
ioengine=libaio
iodepth=2
zonesize=256m
zoneskip=2g
write_bw_log

[/dev/sdb]