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No more tape?

 
 
Lawrence D'Oliveiro
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      09-13-2006
In message <ee5qe1$cqb$(E-Mail Removed)>, jasen wrote:

> On 2006-09-11, Lawrence D'Oliveiro <(E-Mail Removed)_zealand>
> wrote:
>
>> But if the data was corrupted before being written to tape, then it would
>> have been read back from the tape as corrupted, and would have failed to
>> verify when subsequently compared with data reread from the hard drive.

>
> that's not how verification is typically done..


Whatever you're describing is not worthy to be called "verification", then.
 
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Lawrence D'Oliveiro
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      09-13-2006
In message <Xns983CBDA4D40F7daveytaynospamplshot@203.97.37.6> , Dave Taylor
wrote:

> Lawrence D'Oliveiro <(E-Mail Removed)_zealand> wrote in
> news:ee353h $vdf$(E-Mail Removed):
>
>> But if the data was corrupted before being written to tape, then it would
>> have been read back from the tape as corrupted, and would have failed to
>> verify when subsequently compared with data reread from the hard drive.

>
> Not if the corruption was consistent, reproducable, and happened in the
> backup application itself.


Sounds like your backup application is suffering a data-dependent bug, where
certain patterns in the data are consistently triggering the same kinds of
corruption.

> It took a restore to a different volume to find the bug, and the customer
> needed that data.


What you're saying is reinforcing a long-standing prejudice of mine: don't
depend on backups which save things in special formats. Instead, stick with
standard filesystem copy operations for backups.
 
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