Re: why [Saved][D] instead of [Delta][D]?

On 04/05/2021 22:40, imschmeg wrote:
> On Tue, 4 May 2021 15:30:16 -0400
> imschmeg <[email protected]> wrote:
> 
>> On Tue, 4 May 2021 14:35:28 -0400
>> imschmeg <[email protected]> wrote:
>>
>>> On Tue, 4 May 2021 20:10:30 +0200
>>> Denis Corbin <[email protected]> wrote:
>>>   
>>>> On 04/05/2021 02:25, imschmeg wrote:    
>>>>> In another use of dar on a non-encrypted filesystem, I am using
>>>>> options --delta sig and --delta-min-sig-size 1M.  I have a full
>>>>> and a differential with that full as --ref, both with the same
>>>>> --delta.. options.  However, when I list the differential's
>>>>> contents, all [D] files (those with computed deltas) in it are
>>>>> [Saved][D] instead of [Delta][D]. Why might that happen?      
>>>>
>>>> I would increase verbosity (-v option) to have more information
>>>> about what's going on during the different backup.    
>>>
>>> I will do that next.    
>>
>> The problem appears to be solely with --on-fly-isolate.  I cannot
>> reproduce the case I reported previously of getting the same result
>> with -C instead, hence I probably misread my results (scrolling back
>> in a terminal window has it pitfalls).  Using the -va verbosity option
>> doesn't show any significant differences.
>>
>> In other words, a command line like this:
>>
>>> dar -c ./full --on-fly-isolate ./fcat --fs-root ./sub --delta sig  
>>
>> produces a tiny catalog (fcat) that is too small to contain deltas.
>> However, running this afterwards:
>>
>>> dar -C ./ccat --ref ./full --fs-root ./sub --delta sig  
>>
>> produces a larger catalog (ccat) with deltas.  Here are the sizes of
>> the produced files:
>>
>>    199277 ccat.1.dar
>>       315 fcat.1.dar
>>  34147102 full.1.dar
>>
>> I saw your more-recent email about reading "Binary delta options usage
>> and best practices".  I don't see anything there that suggests that
>> catalogs created with --on-fly-isolate are different from those
>> created using -C.
> 
> Oh - the critical sentence was at the end of the --delta sig part of
> the manpage: "Delta signature transfer is not possible for on-fly
> isolation, you need to do normal atchive isolation to obtain  an
> isolated catalogue with delta signatures."
> 
> Sorry for the false alarm!
> 

Good finding :)
ignore my previous answer then

Cheers,
Denis

> 
> 
>