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 AT lists.sourceforge DOT 
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 AT lists.sourceforge DOT 
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 AT lists.sourceforge DOT 
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 AT lists.sourceforge DOT 
net/msg08946.html

See also this thread from December:
    [BackupPC-users] Advice on creating duplicate backup server
http://www.mail-archive.com/backuppc-users AT lists.sourceforge DOT 
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 AT lists.sourceforge DOT 
net/msg13359.html

--
Angus S-F // GeoApps
http://www.geoapps.com/



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