# fio
# flexible I/O tester

# Spawn a number of threads or processes doing a particular type of I/O action
# iodepth = Number of I/O units to keep in flight against the file
# (can be used to initialize an AWS EBS volume)
fio --filename=/dev/xvdf --rw=read --bs=128k --iodepth=32 --ioengine=libaio --direct=1 --name=volume-initialize