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Full Discussion: calculate internal fragmentation in directory
Homework and Emergencies Emergency UNIX and Linux Support calculate internal fragmentation in directory Post 302580113 by Corona688 on Wednesday 7th of December 2011 02:31:15 PM
Old 12-07-2011
Filesystem doesn't matter.

Just:

Code:
#!/bin/bash
DIR=/home/username
# du outputs "blocks folder" so we read both and just ignore the folder.
read USED_K FOLDER <<<$(du -s -B 1024 "$DIR" 2> /dev/null)
# du outputs a header line, then "filesystem blocks used available ..."
# so we ignore the header line with 'tail', then read the first three.
read FILESYSTEM TOTAL_K G <<<$(df -B 1024 "$DIR" | tail -n 1)
echo "$DIR uses $(( (USED_K*100) / TOTAL_K ))% of $FILESYSTEM"

Running this gets me
Code:
/home/username uses 51% of /dev/sdc5

---------- Post updated at 01:31 PM ---------- Previous update was at 01:27 PM ----------

Quote:
Originally Posted by me.
hey methyl and thanks foryouranswer

i know what internal fragmentation is i think i asked wrong way

what i meant was, how to write a script that will calculate in % how much dsck spaceistakingthat directory where script is executed

will appreciate help!

...filesystem is linux-opensuse ext3

---------- Post updated at 02:21 PM ---------- Previous update was at 02:08 PM ----------

if its stillnotclear i will write exactlyhowi got it...

write a script that will calculate amountof internal fragmentation forall files in directory. assume each block is1024 bytes
Which do you want? The space used, or something nebulous about fragmentation?
This User Gave Thanks to Corona688 For This Post:
me.
 

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LEARN ABOUT CENTOS

e4defrag

E4DEFRAG(8)						      System Manager's Manual						       E4DEFRAG(8)

NAME

       e4defrag - online defragmenter for ext4 filesystem

SYNOPSIS

       e4defrag [ -c ] [ -v ] target ...

DESCRIPTION

       e4defrag  reduces  fragmentation  of  extent  based file. The file targeted by e4defrag is created on ext4 filesystem made with "-O extent"
       option (see mke2fs(8)).	The targeted file gets more contiguous blocks and improves the file access speed.

       target is a regular file, a directory, or a device that is mounted as ext4 filesystem.  If target is a directory, e4defrag reduces fragmen-
       tation  of all files in it. If target is a device, e4defrag gets the mount point of it and reduces fragmentation of all files in this mount
       point.

OPTIONS

       -c     Get a current fragmentation count and an ideal fragmentation count, and calculate fragmentation score based on them. By seeing  this
	      score, we can determine whether we should execute e4defrag to target.  When used with -v option, the current fragmentation count and
	      the ideal fragmentation count are printed for each file.

	      Also this option outputs the average data size in one extent. If you see it, you'll find the file has ideal  extents  or	not.  Note
	      that the maximum extent size is 131072KB in ext4 filesystem (if block size is 4KB).

	      If this option is specified, target is never defragmented.

       -v     Print error messages and the fragmentation count before and after defrag for each file.

NOTES

       e4defrag  does  not  support swap file, files in lost+found directory, and files allocated in indirect blocks. When target is a device or a
       mount point, e4defrag doesn't defragment files in mount point of other device.

       Non-privileged users can execute e4defrag to their own file, but the score is not printed if -c	option	is  specified.	Therefore,  it	is
       desirable to be executed by root user.

AUTHOR

       Written by Akira Fujita <a-fujita@rs.jp.nec.com> and Takashi Sato <t-sato@yk.jp.nec.com>.

SEE ALSO

       mke2fs(8), mount(8).

e4defrag version 2.0						     May 2009							       E4DEFRAG(8)
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