speedtest.sh

#!/bin/bash

GIGABYTES="${1:-1}"
ITERATIONS="${2:-1}"
MOUNT="/mnt/tank"

sshhh() {
    grep -v "+0 records"
}

for i in $(seq $ITERATIONS); do
    FILE="$MOUNT/${GIGABYTES}GB"
    echo -n "Writing: "
    sudo dd if=/dev/zero of="$FILE" count=$GIGABYTES bs=1G oflag=dsync 2>&1 | sshhh

    echo -n "Reading: "
    echo 3 | sudo tee /proc/sys/vm/drop_caches >/dev/null
    dd if="$FILE" of=/dev/null bs=8k 2>&1 | sshhh
done