Maintenance File System

l_leonard · 05-03-2007, 02:55 AM

Hi..i am leonard a new member here..
My question is,
If in a file system, the capacities has reached 80%, is there any alert message to user? If is exist, I wish to make it in a script then I implement into crontab
thank u

jlliagre · 05-03-2007, 09:04 AM

Hi and Welcome to LQ.
There is no specific alert sent to users when a FS reach the 80% limit.

A system message is written to the console and /var/adm/messages when a write fails because of a full file system, eg:

Code:

Apr  2 22:01:10 bestouan ufs: [ID 213553 kern.notice] NOTICE: realloccg /s4: file system full

MensaWater · 05-03-2007, 09:40 AM

Of course you can set up alerting for this and many other things.

That could be as sophisticated as a full system (like Nagios with NRPE plugins) or as simple as scripting:

Code:

#!/bin/bash
while true do
HOMEPCT=`/bin/df /home |/bin/grep /home |awk '{print $5}' |cut -d% -f1`
if [ $HOMEPCT -ge 80 ]
then echo "The filesystem is now at ${HOMEPCT}% | /bin/mail -s "Space Alert on /home" yourmailname@yourmaildomain
     /bin/sleep 60
done

The above would check every minute and email you if the space had reached or exceeded 80%. You can change /home to whatever you want or put in multiple lines for each run.

jlliagre · 05-03-2007, 11:28 AM

jlightner: please do not promote such a spam machine !!

There is no point in sending every minute the same message to any user, even oneself.

MensaWater · 05-03-2007, 11:36 AM

I did say it was a "simple" script. It will only email when the filesystem has reached 80%. You're correct that it would email you every minute thereafter.

One COULD put logic in to limit it to so many emails per hour but I wasn't trying to provide a full monitoring solution - just showing that it could be done. I think were it me I'd rather risk being spammed to know my FS was about to be full than to wait to look in the log file AFTER it was full.

As for me I use Nagios with NRPE plugins which was my first suggestion above.