Will Veeam Backup detect a corrupted file on dedup volume ?

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Will Veeam Backup detect a corrupted file on dedup volume ?

Veeam Logoby asaraca » Wed Aug 06, 2014 3:26 pm

We encoutered an issue today on one of our virtualized file server on Hyper-V where we were unable to open a word document file that was on a dedup volume. When I went to try to restore that file on veeam, I had the same issue. The file wa succesfully restored, but I was unable to open it with Word. So is there a way with Veeam to be able to detect if a file is corrupted before backing it up to avoid to have a useless backup ?
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Re: Will Veeam Backup detect a corrupted file on dedup volum

Veeam Logoby Gostev » Wed Aug 06, 2014 3:44 pm

No. Such corruption test would require opening each and every file with the respective application, and observing the result, which is obviously unrealistic thing to do (a single file server can easily have millions of files).

We do something very similar to such testing as a part of SureBackup functionality, but this one is normally used against core production applications, which have their data stored in just a handful of files (for example, Microsoft Exchange normally uses just a few mailbox database files).
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Re: Will Veeam Backup detect a corrupted file on dedup volum

Veeam Logoby asaraca » Wed Aug 06, 2014 4:39 pm

But by doing some tests, I noticed that it's impossible to calculate a CRC on a file that is corrupt in a dedup volume. Would it not be enough to calculate the CRC of a file before backing it up to to catch most dedup errors/corruption before backing the file ?
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Re: Will Veeam Backup detect a corrupted file on dedup volum

Veeam Logoby foggy » Fri Aug 08, 2014 11:43 am

Remember, Veeam B&R is an image-based backup solution, we do not do file-level processing.
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Re: Will Veeam Backup detect a corrupted file on dedup volum

Veeam Logoby Gostev » Fri Aug 08, 2014 8:45 pm

Technically it is possible even with image-level processing, however this will result in huge processing overhead (backup window will go through the roof), and this sort of verification will not detect any file corruptions other than those caused by the storage itself, so it is mostly worthless anyway.
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