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Displaying data usages with help of agedu

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Aegdu - A Tool for Displaying Data Usage


File systems can have hundreds or even millions of files. Tracking how they are used can be very difficult, bordering on the impossible. Fortunately there is a tool, named agedu, that can give you a quick glimpse into the “age” of the data on a directory basis.

install agedu on fedora 10

[root@server ~]# yum install agedu
Loaded plugins: refresh-packagekit
fedora                                                   | 2.8 kB     00:00
updates                                                  | 3.4 kB     00:00
Setting up Install Process
Parsing package install arguments
Resolving Dependencies
--> Running transaction check
---> Package agedu.i386 0:0-1.r8642.fc10 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package        Arch          Version                    Repository        Size
================================================================================
Installing:
agedu          i386          0-1.r8642.fc10             updates           43 k

Transaction Summary
================================================================================
Install      1 Package(s)
Update       0 Package(s)
Remove       0 Package(s)

Total download size: 43 k
Is this ok [y/N]: y
Downloading Packages:
agedu-0-1.r8642.fc10.i386.rpm                            |  43 kB     00:04
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing     : agedu                                                    1/1

Installed:
agedu.i386 0:0-1.r8642.fc10

Complete!

 

To create an index of the directory tree you just run the command.

[root@server ~]# agedu -s /var
Built pathname index, 1010 entries, 65280 bytes of index
Faking directory atimes
Building index
Final index file size = 160136 bytes

 

Note, the "-s [directory]" produces an index file named agedu.dat in the current directory (Note: if the index file is in a directory being scanned, agedu will ignore it).

[root@server ~]# ls -l /root
total 536
-rw------- 1 root root 438548 2010-07-19 04:24 agedu.dat
-rw------- 1 root root   1274 2010-07-16 05:18 anaconda-ks.cfg
drwxr-xr-x 2 root root   4096 2010-07-17 16:08 Desktop
drwxr-xr-x 2 root root   4096 2010-07-16 05:26 Documents
drwxr-xr-x 3 root root   4096 2010-07-16 06:04 Download
-rw-r--r-- 1 root root  49933 2010-07-16 05:18 install.log
-rw-r--r-- 1 root root   4639 2010-07-16 05:17 install.log.syslog
drwxr-xr-x 2 root root   4096 2010-07-16 05:26 Music
drwxr-xr-x 2 root root   4096 2010-07-16 05:26 Pictures
drwxr-xr-x 2 root root   4096 2010-07-16 05:26 Public
drwxr-xr-x 2 root root   4096 2010-07-16 05:26 Templates
drwxr-xr-x 2 root root   4096 2010-07-16 05:26 Videos

Once the index is created you can query it. A great way to get started is to use the HTML display capabilities.

[root@server ~]# agedu -w
Using Linux /proc/net magic authentication
URL: http://127.0.0.1:47523/

copy url and paste it on web browser

 

The web graphics display the age of the files in a specific directory, red being the oldest and green being the newest. The web page orders the directories by the total space used in the directory.

 

By default agedu looks for the oldest file when creating the scale as displayed in the web output. You can use the text option to query the index for the age of the data that doesn’t have to follow that scale. For example, one can scan for the amount of space in each directory that is older than 6 months by the following:

 

[root@server ~]# agedu -a 6m -t /var
132         /var/cache
12          /var/db
4           /var/empty
3772        /var/lib
4           /var/lock
28          /var/log
56          /var/run
24          /var/spool
1148        /var/www
8           /var/yp
5216        /var

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