Re: [BackupPC-users] Backing up a BackupPC server
2009-06-03 17:52:43
Hi,
Peter Walter wrote on 2009-06-03 16:15:37 -0400 [Re: [BackupPC-users] Backing
up a BackupPC server]:
> [...]
> My understanding is that, if it were not for the
> hardlinks, that rsync transfers to another server would be more
> feasible;
right.
> that processing the hardlinks requires significant cpu
> resources, memory resources, and that access times are very slow,
Memory: yes. CPU: I don't think so. Access times very slow? Well, the inodes
referenced from one directory are probably scattered all over the place, so
traversing the file tree (e.g. "find $TopDir -ls") is probably slower than
in "normal" directories. Or do you mean swapping slows down memory accesses
by several orders of magnitude?
> compared to processing ordinary files. Is my understanding correct? If
> so, then what I would think of doing is (a) shutting down backuppc (b)
> creating a "dump" file containing the hardlink metadata (c) backing up
> the pooled files and the dump file using rsync (d) restarting backuppc.
> I really don't need a live, working copy of the backuppc file system -
> just a way to recreate it from a backup if necessary, using an "undump"
> program that recreated the hardlinks from the dump file. Is this
> approach feasible?
Yes. I'm just not certain how you would test it. You can undoubtedly
restore your pool to a new location, but apart from browsing a few random
files, how would you verify it? Maybe create a new "dump" and compare the
two ...
Have you got the resources to try this? I believe I've got most of the code
we'd need. I'd just need to take it apart ...
Regards,
Holger
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- Re: [BackupPC-users] Backing up a BackupPC server, (continued)
- Re: [BackupPC-users] Backing up a BackupPC server, Craig Barratt
- Re: [BackupPC-users] Backing up a BackupPC server, Jeffrey J. Kosowsky
- Re: [BackupPC-users] Backing up a BackupPC server, Holger Parplies
- Re: [BackupPC-users] Backing up a BackupPC server, Les Mikesell
- Re: [BackupPC-users] Backing up a BackupPC server, Peter Walter
- Re: [BackupPC-users] Backing up a BackupPC server, Les Mikesell
- Re: [BackupPC-users] Backing up a BackupPC server,
Holger Parplies <=
- Re: [BackupPC-users] Backing up a BackupPC server, Jeffrey J. Kosowsky
- Re: [BackupPC-users] Backing up a BackupPC server, Pieter Wuille
- Re: [BackupPC-users] Backing up a BackupPC server, Jeffrey J. Kosowsky
- Re: [BackupPC-users] Backing up a BackupPC server, Les Mikesell
- Re: [BackupPC-users] Backing up a BackupPC server, Jeffrey J. Kosowsky
- Re: [BackupPC-users] Backing up a BackupPC server, Les Mikesell
- Re: [BackupPC-users] Backing up a BackupPC server, Lai Chen Kang
- Re: [BackupPC-users] Backing up a BackupPC server, Holger Parplies
- Re: [BackupPC-users] Backing up a BackupPC server, John Rouillard
- Re: [BackupPC-users] Backing up a BackupPC server, Pieter Wuille
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