Manually Collect Disk I/O Every Certain Minutes Using Shell Script

Here is an shell script which collect details for debugging the I/O Performance issues and store historical data into log files. Manually collect Disk I/O Every Certain Minutes using shell script scheduled in crontab. Of course you can use different tools but installing 3rd party tools on production systems leads to security vulnerabilities.

Manually Collect Disk I/O Shell Script

You can free to use this shell script with our own risk, no warranty. What are the processes executed at particular time will captured by script, iostat and top command output. Collected information is more than enough to track the issue.

#!/bin/bash
## Author: Ankam RaviKumar - ARKit
## Date: 9th November 2017
#########################
# Monitoring Tools: #
# - Memory Usage #
# - Disk I/O #
# - Top / oracle #
# #
#########################

MAILLIST="YOUREMAIL@DOMAIN.COM"

# Check Memory usage
echo "arkit-serv-64" >> /var/log/iologfile.`date +%h%d%y`
date >> /var/log/iologfile.`date +%h%d%y`
echo " " >> /var/log/iologfile.`date +%h%d%y`
echo "ps -A --sort -rss -o comm,pmem | head -n 11" >> /var/log/iologfile.`date +%h%d%y`
echo " " >> /var/log/iologfile.`date +%h%d%y`
ps -A --sort -rss -o comm,pmem | head -n 11 >> /var/log/iologfile.`date +%h%d%y`
echo " " >> /var/log/iologfile.`date +%h%d%y`

# IOTOP to gather I/O for 5x @ 2 seconds
echo "iostat -x 2 5" >> /var/log/iologfile.`date +%h%d%y`
iostat -x 2 5 >> /var/log/iologfile.`date +%h%d%y`
echo " " >> /var/log/iologfile.`date +%h%d%y`

# Top - Oracle Process
date >> /var/log/toptool.`date +%h%d%y`
echo "top -n 1 -U oracle" >> /var/log/toptool.`date +%h%d%y`
echo " " >> /var/log/toptool.`date +%h%d%y`
top -n 1 -U oracle >> /var/log/toptool.`date +%h%d%y`
echo " " >> /var/log/toptool.`date +%h%d%y`

date >> /var/log/iologfile.`date +%h%d%y`
cat /var/log/iologfile.`date +%h%d%y` | mail -s "arkit-serv-64 Memory, I/O, & Top Output" ${MAILLIST}

Disk IO Collection using sar Command

Below Shell script will collect Disk IO Average Usage using sar command.

#!/bin/bash
## Purpose: To Collect Disk IO Report using sar command - Arkit
##Author:Ankam Ravi Kumar
## Date: 14th November 2016

## START ##

sar -p -d 1 3 |grep Average |grep -v nodev |tail -5 >> /var/log/diskio
sed -i "s/Average:/`date +%F_%H:%M:%S`/g" /var/log/diskio

sar -p -d 1 3 |grep -v Average |grep -v nodev |grep -v Linux >> /var/log/rdiskio
## END ##

That’s it. Small Shell Script to Manually Collect Disk IO Details and debug performance issue.

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