Re: [BackupPC-users] Moving lots of data on a client

On 08/20/2013 03:28 PM, Arnold Krille wrote:
> On Tue, 20 Aug 2013 14:23:38 -0400 Raman Gupta <rocketraman AT gmail DOT com>
> wrote:
>> I have a client on which about 100 GB of data has been moved from one
>> directory to another -- otherwise its exactly the same.
>>
>> As I understand it, since the data has been moved, BackupPC 3 will
>> transfer all the data again (and discard it once it realizes the data
>> is already in the pool) i.e. it does not skip the transfer of each
>> file even though the checksum is identical to an existing file in the
>> pool.
>>
>> I am using the rsync transfer method.
>>
>> Is there a workaround to prevent all 100 GB of data from being
>> transferred again?
> 
> I think the workaround is to use rsync as transfer ;-) At least when you
> added the "checksum-seed=" parameter to your config, it should
> calculate the checksums on the client and compare with the servers
> database and only transfer contents that differ.

No, checksum-seed doesn't help here. BPC transfers all the data again.
I think checksum-seed caches the checksums on the server, but if BPC
thinks the file doesn't exist on the server side at all (which it
doesn't since it has moved locations), then checksum-seed is irrelevant.

Hopefully BPC 4 will be smarter -- I think I saw a post on
backuppc-devel from Craig indicating that it will be.

> Otherwise I would not manually fiddle with the dirs on the server, its
> far less stress and risk for error if you just let backuppc do its
> thing. Even if that means transfering the files again...

I went ahead with the fiddling -- I'm a bit of a daredevil at heart :)

Regards,
Raman

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