Yeah it will, but when new full backup is taken, you again copy entire
operating system copy over network, even though you have already a few copy of
that operating systém on a target server. So, yeah it will low the traffic, but
not that much as a smarter solution could. :-) Every time you také full backup,
all data will be transfared, every time you will do a incremental backup you
will transfer all files those were changet from last backup even though there
were only added few bytes to the end of a file, and well... Maybe that is good
for you, but I would be much more grateful for something that would do
completely deduplicated replication as you can get for example from NetApp :)
Yeah, I agree that your solution is 1000 times simplier, but also it is less
effective than a deduplicated replication, that I hope can get with lessfs +
DRBD... And yeah, my idea works only in theory, your is really working. :-)
-----Original Message-----
From: John Drescher [mailto:drescherjm AT gmail DOT com]
Sent: Thursday, October 15, 2009 4:08 PM
To: Stopka m Marek; bacula-users
Subject: Re: [Bacula-users] Copying backup "On the fly"
> This is not a solution at all, because Bacula every time you create new
> backup will create new virtual tapes, and since rsync "deduplicate" only
> files, not entire amount of data that is going to be transfared, this do not
> solve anything for us. Acctually I am not even sure if we would use LVM on
> botom and rsync those snapshots of a LVM volumes, I guess rsync do not
> compare hashes of all blocks of transfered but only first block hash with a
> first block, second with a second,... So again, rsync would not be help even
> in this case.
>
I am confused how it does not solve the problem. I am talking about using rsync
to mirror the volume files that bacula uses to store all of your backups. If
you limit the size of these to a few GB, rsync will only be sending the volumes
that have changed but you will still have a complete second copy of the bacula
volumes offsite.
John
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