So, whatever how it does, I think that is a good idea set up a Verify Job
soon after a Backup Job to ensure that data in the volume, isn't it?
On Thu, Jun 2, 2011 at 8:18 AM, Martin Simmons <mar...@lispworks.com> wrote:
> >>>>> On Thu, 2 Jun 2011 11:10:32 +0200, Ralf Gross said:
> >
> > 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.
>
> It defintely doesn't recalculate the md5sums from the data streams, but it
> does check the crc of every block so it should detect corruption at that
> level. It also checks that the catalog and volume contain the same list of
> files.
>
> __Martin
>
>
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