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a maybe silly question about xfsdump

To: Xfs <xfs@xxxxxxxxxxx>
Subject: a maybe silly question about xfsdump
From: Marko Weber|8000 <weber@xxxxxxxxxx>
Date: Tue, 20 May 2014 17:33:15 +0200
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hello, again me ;-)

i use at runtime this command to backup root partition of a server:

xfsdump -f /var/backup/root2.dump -l 0 -p 5 -L rootdump -M rootdump /


i googled around alot, cause a question wont get out of my mind:
is this backup consistent?
And what about consistency when i backup a mysql partition at runtime?

but my most wondering is abot this:

bunka ~ # df -h
Filesystem                     Size  Used Avail Use% Mounted on
/dev/root                      135G   11G  125G   8% /


but the saved dump shows:


bunka ~ # ls -lh /var/backup/

-rw-r--r-- 1 root root 8.4G May 20 17:29 root2.dump


why is there such a great difference between df -h and the stored dump?

can you give me some enlightment?

thank you

marko





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