Zitat von James Harper <james.harper AT bendigoit.com DOT au>:

>> Hello List
>>
>> i recently read about the NTFS change journal and its aim to support backups
>> in finding files for incremental backups. Are there any plans to  
>> maybe include
>> such a feature in the windows client? I suspect this would be  
>> really helpful on
>> bigger sized filesystems with a lot of files. Information about the NTFS
>> feature can for example found here:
>> http://msdn.microsoft.com/en-us/library/aa363798.aspx
>>
>
> I've implemented this in an unsubmitted patch. The problems I found are:
>
> . takes a bit of memory to hold the data

Not sure what you mean. Must the changelog be hold in (real) Memory  
for some reason or is it simply related to the next one below?

> . it doesn't completely solve the accurate problem for any 'since'  
> date unless you keep the complete log in memory rather than 'this  
> file has changed' (although it would in the regular  
> since-last-backup case)

The accurate problem is the one with reappearing files on restore from  
incremental backup, no? But the deleted files are also logged in the  
change journal so we are at the same point as of now without the need  
to search the whole volume for changes in the most cases.

> . bacula really needs to store the FRN in the catalog, which takes  
> extra space

Would this be per Job or per File? Should be per Job, no?

> Another idea I had was to cross reference the MFT vs the accurate  
> file information. Enumerating the MFT isn't particularly quick, but  
> it is orders of magnitude faster than actually traversing the entire  
> filesystem looking for changes. If Bacula recorded the FRN and the  
> last USN then a "is file changes?" would be straightforward.
>
> I can send the patch (against 5.2.0 I think) if you would like to  
> use it as a starting point.

Nice to here that at least the idea could not be that dumb :-) Would  
be really nice to see and maybe a pointer to already happend  
discussion on the list.

Many Thanks

Andreas



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