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#!/bin/bash
 
# log-iowait.sh
 
# a script to log the I/O load, 
# and store the output as CSV format, which can be opened directly in Excel
 
# Great for troubleshooting I/O related problems
 
# set this to run every minute in cron
 
logfile=/tmp/log-iowait.csv
 
# show timestamp + I/O wait statistic 
# -d 1 3 = delay 1 second, run 3 times (first run are usually spiked)
echo "\"`date +%H%M`\",\"`iostat -d 1 3 -c | tail -n 6 | head -n 1 | cut -c 35-39`\"" >> $logfile