Bacula-users

[Bacula-users] How does Bacula back-up files?

2011-05-13 08:35:41
Subject: [Bacula-users] How does Bacula back-up files?
From: obviously <bacula-forum AT backupcentral DOT com>
To: bacula-users AT lists.sourceforge DOT net
Date: Fri, 13 May 2011 05:32:05 -0700
Hello,

I have a question I can't solve...

The is the situation:

I create a file with: dd if=/dev/urandom of=test.bin bs=10M count=300
This gives me a file of 3GB.
I check it's MD5 with md5sum test.bin

I clear my cache with echo 3 > /proc/sys/vm/drop_caches.

I check my chache with free -m.

I start a backup with Bacula of only 1 file, namely test.bin

Again, I flush the cache and when the back-up job is starting I remove the 
test.bin file on the server.

And Bacula doens't react at all, it keeps backing up the file like it is still 
there.

The backup finishes with no warnings, even it is removed during the backup.

I restore the test.bin file from tape and checks the md5 of it, and strangely 
the md5sum is the same... 

So my question, how does Bacula do this? Cause I remove the file during the 
backup and flush the cache frequently...

I hope you guys understand my q, my english is realy bad :) excuse me...

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