[Lustre-discuss] Min requirement

[Thomas Anderson]

What is min space requirement to install lustre (just for testing)? I
read doc (http://build.whamcloud.com/job/lustre-manual/lastSuccessfulBuild/artifact/lustre_manual.pdf)
And it seems only refers to production environment. For example, 160
GB with average file size around 5m in MDT/ MDS section.

In addition, how to completely remove lustre? I follow the doc
http://wiki.lustre.org/index.php/Debian_Install to install lustre on
virtualbox (10G disk space/ 1G memory). But after removing lustre, df
-kh still shows disk is nearly full.

Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1             9.4G  7.1G  1.9G  80% /

But with find command (find / -type f -size +50M -exec ls -lh {} \; |
awk '{ print $9 ": " $5 }')

/usr/src/linux-source-3.0.0.tar.bz2: 73M
/proc/kcore: 1018M
/home/user/important.file: 1.9G

Seems some disk space (not listed by df -kh) is occupied by process?
How can I completely clean up lustre?

Env: kernel 3.0.0-1-686-pae, debian wheezy.

Thanks.