Follow

Disk Utilization Test (snmp) in Linux based machines

Outcome: Reported Disk Utilisation % in Traverse is NOT inclusive of 5% disc space reservation for root.

Explanation:

In Linux based machine there is normally 5% disc space reservation for root.

It is observed that Disk Usage % reported by command 'df' will be different from that is reported by snmp.

 

  •  explanation of 'Use%' of this command: 'df -h'
[krish.majumder@bigair ~]$ sudo df -h
[sudo] password for krish.majumder:
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvde        99G   75G   19G  80% /

Use% = (Size - Avail)/Size
80.80% = (99 - 19)/99

Note: Avail does not include 5% disc space reservation for root. This is evidenced by following calculation

(99 - 75 -19) = 5GB

  •  explanation of 'Use%' by snmp

Use% = Used / Size = 75 / 99 = 75.75% (Traverse will report this)

 

Further note: Why The Linux df Command Shows Lesser Free Disk Space?
http://www.walkernews.net/2011/01/22/why-the-linux-df-command-shows-lesser-free-disk-space/

Was this article helpful?
0 out of 0 found this helpful
Have more questions? Submit a request

0 Comments

Article is closed for comments.