On 03/12/2014 08:04 PM, Les Mikesell wrote:
> On Wed, Mar 12, 2014 at 1:36 PM, Holger Parplies <wbppc AT parplies DOT de>
> wrote:
>> kpolberg wrote on 2014-03-10 11:32:35 +0100 [[BackupPC-users] Documentation
>> on XferLOG]:
>>> I was looking at my XferLOG's and noticed some log lines which I could
>>> not understand.
>>>
>>> pool 640 500/500 131068 2003.04.12 -
>>> Påskeferien/100-0083_IMG.JPG
>>> same 640 500/500 108343 2003.04.12 -
>>> Påskeferien/100-0084_IMG.JPG
>>>
>>> Basically, what is the difference between "pool" and "same" ?
>> "same" means that it was an rsync backup and the rsync method found that the
>> file was identical to the same file in the reference backup and created a
>> link
>> to that.
>> "pool" means that the file was transferred (possibly as an rsync delta, so
>> that does not necessarily mean a lot of data has crossed the network) and
>> then
>> found to exactly match a file already in the pool. A link was created to the
>> pool file.
> Note also that your reference is the last full backup, not necessarily
> the 'last' backup, so a file that is changed or added in one
> incremental will still be changed/new in subsequent incrementals (and
> thus copied but matched in the pool) until another full run rebuilds
> the base. Unless you are doing incremental levels.
>
I managed to only reply to Les, but for future reference I'm posting my
answer to the list as well...
Thank you for the extensive feedback. Did a quick test by restoring a
file from different backups and running md5sum. Couldn't find any
differences, so I'm not quite sure what is going on here. But from your
feedback, I guess this could be attributed to the checksumming in rsync.
As the file is correctly linked to a file already in the pool. Basically
what I was afraid of was bitrot or other issues.
Further on, looking back at Holger's reply. It seems there has been
quite a lot of feedback regarding the various image viewing / editing
tools I'm using regarding editing of at least EXIF data which isn't
good. I would have at least expected these tools to keep the original
and do the changes in a different version of the file. But this it seems
is not the case.
For now my concerns are greatly reduced, atleast regarding the integrity
of the RAID / File system wise. With regards to the tools I use for
image editing and so on is a different story.
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