Hello Heitor,

On 2020-05-12 17:14, Heitor Faria wrote:
>  
>> You can also check the job type=verify level=volumetocatalog that can
>> read a tape and compare all attributes with the catalog data. It works
>> at the volume level, and it might be better for tapes.
> 
> This is nice, but I think it would not verify backup stored data portion 
> (only metadata):
> 
> "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. Although the 
> attribute data including the signatures (MD5 or SHA1) are compared, the 
> actual file data is not compared (it is not in the catalog)."
> 
> I suppose a bad block on the data portion would be undetected? 

On tape it will be detected, it is usually not possible to read a bad
block without an error, the tape drive is supposed to check it.

Note that bls or bscan will not check if the data is consistent, but it
will do the same, read all blocks and trigger hardware errors.

Best Regards,
Eric


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