Solved

Linux df command

Posted on 2014-11-28
6
228 Views
Last Modified: 2014-12-15
Hi Experts,
I've this Linux machine:
Linux version 2.6.18-371.3.1.el5xen (gcc version 4.1.2 20080704 (Red Hat 4.1.2-54))

I run df command:

[ora11g@hy]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/vg_ora
                             9.7G  6.8G  2.5G  74%       /u01
/dev/lv_ora
                              59G   47G  8.2G  86%      /sxr/oracle
                                
      
I'd like to know Why the total size 9.7G isn't the same as Used+Available 6.8G + 2.5G (9.3G) and total 59G isn't the same as 47G + 8.2G (55.2)?

Thanks in advance!
0
Comment
Question by:ralph_rea
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 35

Accepted Solution

by:
Kimputer earned 500 total points
ID: 40470362
Automatically reserved for root (during disaster, like storage fully filled, root can still log in, and do some work).
0
 

Author Comment

by:ralph_rea
ID: 40470376
I Know that 5% of the disk might be reserved for root but with plus 5% is still less of total size 59G
0
 
LVL 13

Expert Comment

by:Alexander Eßer [Alex140181]
ID: 40470400
0
Use Case: Protecting a Hybrid Cloud Infrastructure

Microsoft Azure is rapidly becoming the norm in dynamic IT environments. This document describes the challenges that organizations face when protecting data in a hybrid cloud IT environment and presents a use case to demonstrate how Acronis Backup protects all data.

 
LVL 40

Expert Comment

by:omarfarid
ID: 40470468
The difference in size you observed is due to file system over head, There is no exact ratio for this as it depends on factor like number of files or dirs and their sizes.
0
 
LVL 78

Expert Comment

by:arnold
ID: 40470885
Amount of space used is based on number of files and their space, inodes have a minimum file size (often 4k)such that a 1character file (1 byte)  will account for 4k of space used when computing how much space is left while not being reflected in actual space used.
0
 
LVL 62

Expert Comment

by:gheist
ID: 40471926
Can you post df output without parameters?
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The purpose of this article is to fix the unknown display problem in Linux Mint operating system. After installing the OS if you see Display monitor is not recognized then we can install "MESA" utilities to fix this problem or we can install additio…
Google Drive is extremely cheap offsite storage, and it's even possible to get extra storage for free for two years.  You can use the free account 15GB, and if you have an Android device..when you install Google Drive for the first time it will give…
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
In a previous video, we went over how to export a DynamoDB table into Amazon S3.  In this video, we show how to load the export from S3 into a DynamoDB table.

756 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question