On 16 Aug 2009 at 14:11, Michael 'Moose' Dinn wrote:
> > another unit offsite. The extensive use of hardlinks prevents
> > rsync from being the right solution here.
>
> rsync -H doesn't work for you?
>From earlier discussions on the list:
Re: [BackupPC-users] backup of backup machine
"Note that using -H to reconstruct hardlinks only works for links among
the files traversed during a single rsync run."
http://www.mail-archive.com/backuppc-users@lists.sourceforge.net/msg04386.html
Doesn't seem like that would work correctly for repeated 'rsync -H' runs ...
Also:
------- Included Stuff Follows -------
Re: [BackupPC-users] Hard links & encryption
"It is generally believed on this list (I believe) that it's not feasible
to use something as 'high-level' as rsync to replicate BackupPC's pool.
The amount of memory needed by rsync will just explode because of all the
hardlinks. ..."
--------- Included Stuff Ends ---------
Found here:
http://www.mail-archive.com/backuppc-users@lists.sourceforge.net/msg08933.html
Further messages in this thread indicate it won't work on large backup sets,
such as those you might get backing up a small company's 15-30 computers:
"It will work up to some limit on filenames and hardlinks that backuppc
archives are likely to exceed. There are 2 issues - there is a fixed
memory overhead per filename that is handled in a single run and the
mechanism to match up the linked files doesn't scale well. "
http://www.mail-archive.com/backuppc-users@lists.sourceforge.net/msg08943.html
"If I'm reading that correctly, that's only about 10GB of data. I once
tryed syncing 100GB of backuppc pool data from one disk to another, on the
same machine, with the machine having 512MB RAM and 2GB swap; and after a
day or so, the machine ran itself out of memory and swap, making it
necessary to power-cycle it. I then did the copy with dd; and it only took
a few hours. If you have lots of RAM and little data; it will work. it's
not a general-purpose scaleable solution tho. "
http://www.mail-archive.com/backuppc-users@lists.sourceforge.net/msg08946.html
See also this thread from December:
[BackupPC-users] Advice on creating duplicate backup server
http://www.mail-archive.com/backuppc-users@lists.sourceforge.net/msg12503.html
and this one from February:
[BackupPC-users] how to backup the backuppc server (off site)
http://www.mail-archive.com/backuppc-users@lists.sourceforge.net/msg13359.html
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Angus S-F // GeoApps
http://www.geoapps.com/
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