fio-gcp

Throughput or Bandwidth test

fio throughput.fio

IOPS test

fio iops.fio 

Latency test

fio latency.fio

Some Tips:

1. Database workload specific testing

OLTP : Small Random I/O

rw=randrw
bs=1K

OLAP : Large Sequential I/O

rw=read
bs=1M