[sam-qfs-discuss] [sam-managers] Disk Archiving File corruption

[Ted Pogue]

Also, there apparently was an issue with disk archiving corruption that was
fixed in patch 4.6-03. I recommend anyone using disk archiving upgrade 
to this
patch ASAP.
Ted

Ted Pogue wrote:
> Prasun,
>     There is a known issue with the stager checking tar headers for disk 
> archives in 4.6.
>
> *Synopsis*: Tar header validation skipped
>
>
> We expect the fix to be in the next 4.6 patch, due out early next year.
>
> Ted
>
>
>
> Prasun Gupta wrote:
>   
>> We use disk archiving for backing up data. We discovered a bunch of 
>> corrupted files on the filesystem. In troubleshooting, I found out 
>> that the staging an offline file from an archive (tar file), will give 
>> back garbage if the file is not part of an archive.
>> This happened to be the case, as a few weeks back archiver logs showed 
>> a file was archived to a archive file, but it never went there, 
>> another strange thing was the archiver had reset the counter back to a 
>> lower numbered file also. These archives were never written to the 
>> destination.
>>
>> But the inode of the file and the archive were inconsistent with the 
>> filesystem.
>>
>> I know of one remedy to resolve this problem is turn on checksum on 
>> the file system, but this is going to put a lot of load on the server.
>>
>> Is there another way ?
>>
>> Why does the staging process not check if the tar archive file 
>> contains file or not, instead of returning garbage back?
>>
>> Has anyone run into this problem ?
>>
>> I am currently checking the archive log records with the actual 
>> archive file listings to determine how widespread this problem might 
>> be, Is there a better way to determine file archive inconsistency ?
>>
>>
>> Any Help or pointer will be greatly appreciated, Thanks in advance.
>>
>> --Prasun
>>
>>     
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