On Wed, Feb 24, 2010 at 4:13 PM, Gavin Carr gavin@openfusion.com.au wrote:
On Wed, Feb 24, 2010 at 10:38:32AM +0100, David Hrbáč wrote:
Dne 24.2.2010 10:00, Agnello George napsal(a):
We have an issue with one of our clients , they have a mail server
with
the /var/spool/imap partition as 150 GB . They need to take
differential
backup on to /backup partition ( a different HDD of total 250 GB space
) .
We have tried dar , rsync, rdiff and impasync . But its is not
sufficing the
need as to take a lot of time and consumes a lot of I/O .
Is there any back up solution that you can think of , that can work in
this
situation - open source or proprietary
Is seems to me, that you are using mbox format. So, differential backup is hard to achieve. Migrate to maildir, every mail is a file, easy to backup differentially.
rsync and rdiff should handle mbox format okay though. Though I agree Maildir is generally nicer for differential backups.
Agnello, how long is "a lot of time"? A backup is always going to have to walk the entire tree and checksum (or at least stat) every file, so there's a minimum cost you're always going to have. How long does a 'find /var/spool/imap -ls' take, for instance?
You might want to try brackup (http://code.google.com/p/brackup/). For very large trees of relatively small files it seems to significantly out-perform rsync-based backups. I've got brackup packages in my repository (see http://www.openfusion.net/linux/openfusion_rpm_repository).
Cheers, Gavin
is it possible with " brackup " http://code.google.com/p/brackup/ to back it up to a different server on the same lan instead of /backup . Is there any documentation on the same .