On Mon, Jan 11, 2016 at 10:58 AM, Gandalf Corvotempesta
<gandalf.corvotempe...@gmail.com> wrote:
> 2016-01-11 17:28 GMT+01:00 Les Mikesell <lesmikes...@gmail.com>:
>> I haven't used v4 but it sounds like you have some issue with your
>> network, rsync, or lack of resources. The main difference between a
>> full and incremental should just be that the full will do a complete
>> read on the client side. The actual data transferred should not be
>> much different. If it works the same as v3, the block checksums are
>> not cached until the 2nd full backup of a file, so the 3rd and
>> subsequent full runs become faster since the server does not have to
>> uncompress everything for the comparison. My usual approach with v3
>> was to start a full run on a Friday before leaving work so it would
>> have the whole weekend to complete for the first few runs and would
>> generally stay well enough on schedule to keep fulls on a weekend.
>
> I don't have any issue with my network, the same server, with Bacula
> (i'm running Bacula and BackupPC on the same server, obviously one per
> time)
> will backup the same huge client in 16 hours, not 3 days.
>
> Same server, same disks, same network, same client.
>
What about RAM and disk speed? Backuppc with rsync is much more
resource intensive in those areas than just about anything else since
it is compressing everything on the server side and it holds most or
all of the directory listing in RAM. It is especially slow in the
case of large files with embedded small changes because it
reconstructs a complete new version by uncompressing and copying bits
from the previous version and merging the new parts which will involve
a lot of disk seeks. Also, v4 does something to try to find existing
matching content even with different names or from different clients.
This might be expensive in the case of large numbers of files - since
there aren't a lot of users yet there may not be anyone with
experience with all of the possibilities. In any case you might check
to see if the server side has free RAM and is not swapping to disk.
--
Les Mikesell
lesmikes...@gmail.com
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