John Drescher schrieb:
> On Thu, Jun 2, 2011 at 5:10 AM, Ralf Gross <Ralf-Lists AT ralfgross DOT de> 
> wrote:
> > John Drescher schrieb:
> >> On Thu, Jun 2, 2011 at 4:05 AM, Ralf Gross <Ralf-Lists AT ralfgross DOT 
> >> de> wrote:
> >> > Rickifer Barros schrieb:
> >> >> Yes John...
> >> >>
> >> >> Now, I think that I understood perfectly and I have tested it too.
> >> >>
> >> >> VolumeToCatalog = Compares the files in a Storage Volume with the 
> >> >> Catalog;
> >> >
> >> >
> >> > VolumeToCatalog does not read the file content and compares it, it just
> >> > reads the attributs and compares them (md5sum....).
> >> >
> >> > quote:
> >> > http://www.bacula.org/en/dev-manual/main/main/Configuring_Director.html
> >> >
> >> > VolumeToCatalog
> >> >    This level causes Bacula to read the file attribute data written
> >> > to the Volume from the last Job. The file attribute data are compared
> >> > to the values saved in the Catalog database and any differences are
> >> > reported. This is similar to the Catalog level except that instead of
> >> > comparing the disk file attributes to the catalog database, the
> >> > attribute data written to the Volume is read and compared to the
> >> > catalog database.
> >>
> >> This part to me says it does compare the data on the volume with the
> >> hash MD5/SHA1 that is stored in the database.
> >
> >
> > I always thought that a VolumeToCatalog job would not read the
> > data written to the volume and calculate the md5sum again. Instead it
> > would just read the file attributes that were written to the volume and
> > compare that with the attributes in the catalog.
> >
> > At least the volume format described in developers.pdf suggest that the 
> > md5sum
> > information is part of the data stream.
> >
> > 10.7 Record Header
> >
> > #define STREAM_UNIX_ATTRIBUTES 1 /* Generic Unix attributes */
> > #define STREAM_FILE_DATA 2 /* Standard uncompressed data */
> > #define STREAM_MD5_SIGNATURE 3 /* MD5 signature for the file */
> > #define STREAM_GZIP_DATA 4 /* GZip compressed file data */
> > /* Extended Unix attributes with Win32 Extended data. Deprecated. */
> > #define STREAM_UNIX_ATTRIBUTES_EX 5 /* Extended Unix attr for Win32 EX */
> > #define STREAM_SPARSE_DATA 6 /* Sparse data stream */
> > #define STREAM_SPARSE_GZIP_DATA 7
> > #define STREAM_PROGRAM_NAMES 8 /* program names for program data */
> > #define STREAM_PROGRAM_DATA 9 /* Data needing program */
> > #define STREAM_SHA1_SIGNATURE 10 /* SHA1 signature for the file */
> > #define STREAM_WIN32_DATA 11 /* Win32 BackupRead data */
> > #define STREAM_WIN32_GZIP_DATA 12 /* Gzipped Win32 BackupRead data */
> > #define STREAM_MACOS_FORK_DATA 13 /* Mac resource fork */
> > #define STREAM_HFSPLUS_ATTRIBUTES 14 /* Mac OS extra attributes */
> > #define STREAM_UNIX_ATTRIBUTES_ACCESS_ACL 15 /* Standard ACL attributes on 
> > UNIX */
> > #define STREAM_UNIX_ATTRIBUTES_DEFAULT_ACL 16 /* Default ACL attributes on 
> > UNIX */
> >
> >
> >
> > So I think that only the md5sums on the volume are compared with the 
> > md5sums in
> > the catalog. If the file data on the volume was damaged somehow this could 
> > not
> > be detected.
> >
> 
> The reason I think it is reading the volume is the comparison to the
> Catalog level which has to read the filesystem data to compare that to
> the md5sum in the catalog.
> 
> http://bacula.org/5.0.x-manuals/en/main/main/Using_Bacula_Improve_Comput.html

Hm, I really don't know.

VolumeToCatalog
"This level causes Bacula to read the _file_attribute_data_ written to
the Volume from the last Job."

The best way would to test it or ask Kern on the dev list. I see you
already have a test case ;)

Ralf

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