On 12/03 09:23 , Arch Willingham wrote:
> Anyway, my question is that even though we are supposed to tote tapes off
> site, there are times I am sure it does not happen. Has anyone ever used
> Backup PC to backup a site from off site?
I've got a couple of cases like this; where a BackupPC server is located
offsite somewhere distant from the main facility. Some notable points that
you may already be aware of:
- Don't try to replicate another backuppc server with rsync. As was noted by
Koen Linders, rsync is too memory-intensive. After a certain amount of
data, you'll run the machines out of memory before you can transfer the
data.
- Instead of replicating the backuppc server; just do backups in parallel
with it. As long as you don't have too much data to move ("too much" being
defined by how much bandwidth you have); it's not unreasonable (tho you
might have to limit what you back up that way to just the more important
data). The other advantage of this is that if the first backup server
fails; you still have a redundant backup process going on.
- I tend to plan on being able to move about 13GB of data per weekend over a
DSL line. (I say weekend because that way the backup doesn't interfere
with work, and can run longer). The theoretical limits are higher; but
this is what I found as a practical limit for one of the offsite backup
servers I had. I think it was probably a 768k/s upload link; tho it might
not have been getting that full speed. YMMV; but look at your results as
well as test the system and find out what kinds of data transfer
quantities you can *actually* get; not just theoretically. IRL you may
only get half as much data moved over a given period of time than you're
expecting.
- Make sure you use compression, and you may find benefit to using a
different encryption cipher. (blowfish-cbc and arcfour have worked for me
or other people at some times in some tests, reducing CPU load and
increasing bandwidth.).
$Conf{RsyncClientCmd} = '$sshPath -C -o CompressionLevel=9 -c blowfish-cbc -q
-x -l rsyncbakup $host $rsyncPath $argList+';
- It may be good to trim away volatile directories; like /var/log or /tmp or
/var/tmp. (I do.)
--
Carl Soderstrom
Systems Administrator
Real-Time Enterprises
www.real-time.com
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