Configure monitoring in Linux for a MegaRaid controller

In Linux, monitoring for a MegaRaid controller can be done using MegaCLI tools.

Some prerequisites for it are required, let’s install them.

For Debian like systems:

apt install mailutils postfix libncurses5 alien vim unzip wget

For CentOS like systems:

yum install mailx postfix ncurses-devel vim unzip wget

Then let’s download MegaCLI sources, extract, install it and clean-up.

For Debian like systems:

cd /opt
wget https://docs.broadcom.com/docs-and-downloads/raid-controllers/raid-controllers-common-files/8-07-14_MegaCLI.zip
unzip 8-07-14_MegaCLI.zip
cd Linux
alien MegaCli-8.07.14-1.noarch.rpm
dpkg -i megacli_8.07.14-2_all.deb
cd ..
rm -rf 8.07.14_MegaCLI.txt 8-07-14_MegaCLI.zip DOS/ FreeBSD/ Linux/ Solaris/ Windows/

For CentOS like systems:

cd /opt
wget https://docs.broadcom.com/docs-and-downloads/raid-controllers/raid-controllers-common-files/8-07-14_MegaCLI.zip
unzip 8-07-14_MegaCLI.zip
cd Linux
rpm -i MegaCli-8.07.14-1.noarch.rpm
cd ..
rm -rf 8.07.14_MegaCLI.txt 8-07-14_MegaCLI.zip DOS/ FreeBSD/ Linux/ Solaris/ Windows/

Create a link for easier access:

ln -s /opt/MegaRAID/MegaCli/MegaCli64 /bin/megacli

Check the actual status for disks:

/bin/megacli -PDList -aALL |grep "Drive has flagged a S.M.A.R.T alert"

Normally it will indicate “Drive has flagged a S.M.A.R.T alert : No” for each disk.

Create the script for monitoring:

vim /opt/raidmon.sh

Put the content:

#!/bin/bash
set -ex
RESP=$(/bin/megacli -PDList -aALL |grep "Drive has flagged a S.M.A.R.T alert")
SUBJ="RAID status on server.example.com"
echo "$RESP" | mail -a "From: monitoring@server.example.com" -s "$SUBJ" your@mailaddress.com

Make the script executable:

chmod 700 /opt/raidmon.sh

Add a cronjob to execute the script periodically:

crontab -e

First time when you edit the crontab it will ask to choose an editor, choose 2 and hit Enter:

Select an editor. To change later, run 'select-editor'.
1. /bin/nano <---- easiest
2. /usr/bin/vim.basic
3. /usr/bin/mcedit
4. /usr/bin/vim.tiny

Choose 1-4 [1]: 2

For me it was enough to get an update daily (at 12:04 AM):

4 0 * * * /bin/sh /opt/raidmon.sh

But it can be easily updated to notify only in case of issues:

#!/bin/bash
set -ex
RESP=$(/bin/megacli -PDList -aALL |grep "Drive has flagged a S.M.A.R.T alert")
SUBJ="RAID status alert"
if [[ "$RESP" == *"Yes"* ]]; then
echo "$RESP" | mail -a "From: monitoring@server.example.com" -s "$SUBJ" your@mailaddress.com
done

Set the crontab to run it every minute:

* * * * * /bin/sh /opt/raidmon.sh

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