If you want an idea what isn't possible;

A year ago I tried copying a much pool much smaller too an USB disk than my
current (see lower), using a Xeon 2.8 GHz/1 MB with 2 GB DDR and it ran out
of memory copying via rsync -H

Somewhere in the mailing is other information. 

Someone said he does an rsync on a 2million file pool worked perfectly for
him with 2 GB of memory. Not for me.

Now I stop backuppc at night and do: dd if=/dev/sda5 of=/dev/sdb1 bs=4K 
It works perfectly. I managed to copy this pool back to another server with
much bigger raid1 array formatted ext3 with same blocksize. And it works
with a problem afterwards afaik.

Pool is 235.52GB comprising 718235 files and 4369 directories (as of 19/3
04:12), 
Pool hashing gives 121 repeated files with longest chain 11, 
Nightly cleanup removed 6736 files of size 5.27GB (around 19/3 04:12), 
Pool file system was recently at 61% (19/3 10:02), today's max is 61% (19/3
04:00) and yesterday's max was 61%.

Greetings,
Koen Linders

-----Oorspronkelijk bericht-----
Van: stoffell [mailto:stoffell AT gmail DOT com] 
Verzonden: woensdag 18 maart 2009 21:57
Aan: General list for user discussion, questions and support
Onderwerp: Re: [BackupPC-users] cloning the pool

> I want to clone the pool to a local disk attached via USB.
> I can't made it with a dd because the pool is on a raid volume
> that don't contain the pool only.

We're about to do exactly the same thing. This to get ourselves a
weekly off-site copy. We will use 500 GB external disks to "rsync -aH"
the complete backuppc directory to this disk. We will use lvm and some
encrypted filesystem for enhanced security.

We'll have to test it out because the wiki is not very clear about it:
"rsync has different limitations than cp - don't ask me whether it's
better or worse. It's simply something different to try."

It might be nice to have some "case studies" / "usage scenarios" on
the backuppc wiki ?

I'll report our experiences after we tested it all out..

cheers
stoffell

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Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
easily build your RIAs with Flex Builder, the Eclipse(TM)based development
software that enables intelligent coding and step-through debugging.
Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
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