Hi list,

I don't seem to find as much time for posting on this list lately as I'd like
to. Since that won't change for at least two weeks, I'll write a few short
comments now. Please excuse me for being a bit terse about it and only
providing some keywords. I hope others will follow up with more information.

Let's start with this thread (but it applies to others as well).

Angus Scott-Fleming wrote on 2009-08-17 12:57:14 -0700 [Re: [BackupPC-users] 
Feature Requests and such?]:
> 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?

I fully agree that it doesn't scale, but the point is valid that it *could*
work for you now. The only way to see if it does is to try it out.

> 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 ...

The point is that rsync needs to see the full BackupPC pool during one run.
You can't split it up into seperate syncs of pool/, cpool/, pc/host1/,
pc/host2/ and so on. rsync updates of the pool *should* work, provided they
again get to see the whole system in one pass. "Should work" as in "I haven't
heard definite success stories including verification of the copy, and I have
some doubts".

> [...]
>     "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. "

It's not a matter of pool size but of file count (inodes and, possibly, number
of links pointing to them).

Hope that helps.

Regards,
Holger

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