Toni Van Remortel wrote:
> But I don know that BackupPC does use more bandwidth.
> Besides: when dumping a full backup, the 'pool' means (I hope): file
> already in pool, using it. If not, then there is a problem, as those
> files are already in another backup set of the test host. But BackupPC
> pulls them over anyway.
I'm not sure what you mean by 'pool' here. The only thing relevant to
what a backuppc rsync transfer will copy is the previous full of the
same machine. Files of the same name in the same location will use the
rsync algorithm to decide how much, if any, data needs to be copied -
anything else will be copied in full. When a newly transferred file is
being linked to the pool, it may be discovered at that point that
identical content already exists and a link will be made to save storage
space.
>> It should work the way you expect as-is, although the rsync-in-perl
>> that knows how to read the compressed archive is somewhat slower.
> The problem ain't the backup server nor it's speed. The problem is the
> data transfer.
>
> And I have set up BackupPC here 'as-is' in the first place, but we saw
> that the full backups, that ran every 7 days, took about 3 to 4 days to
> complete, while for the same hosts the incrementals finished in 1 hour.
> That's why I got digging into the principles of BackupPC, as I wanted to
> know why the full backups don't works 'as expected'.
Did you have a full backup of the same host in place with most files
unchanged at the time you expected a low bandwidth full to happen? It
is still possible for the time to to be much longer than an incremental,
depending on the number of files and the speed and memory of the
machines but it should not be using much more bandwidth.
--
Les Mikesell
[EMAIL PROTECTED]
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