#!/bin/bash

EXP1NAME=exp1-many-files

[ -z "$2" -o -z "$1" ] && echo "FAILURE need 2 parameters: param1 is size of each file (e.g. 10k), param2 is number of final files" && exit
EXP1SIZE=$1
EXP1COUNT=$2
echo "parameters are all good"
echo "EXP1SIZE = $EXP1SIZE"
echo "EXP1COUNT = $EXP1COUNT"

# back to home dir
cd $HOME
rm -rf ${EXP1NAME} 2> /dev/null
mkdir ${EXP1NAME}


echo 'START'
# using dd to generate 1 big file then split to split
# we use random data to make sure data is written.
cd $HOME
cd ${EXP1NAME}
echo "Generating one file by adding ${EXP1COUNT}  blocks of ${EXP1SIZE} with random content from /dev/urandom"
time dd if=/dev/urandom of=random.img count=${EXP1COUNT} bs=${EXP1SIZE} > /dev/null 2>&1
echo "splitting the file into ${EXP1COUNT} pieces"
time split -n ${EXP1COUNT} random.img
sync
echo 'END'