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NT Data Corruption

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by deathgod

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Every so offen we get major corruption occuring. It only occurs after a full backup of the system and only on our PDC which has the company data. We use Backup Exec and have Accelerator options installed. We also have all the other options but have removed them. The disks in the PDC are on a RAID 5 array. The only drive that gets corrupted is the DATA drive which is a seperate partition from the system drive. The tape unit is running off of a Motherboard Adaptec SCSI Port and we do receiveerror messages regarding the tape drive like SCSI timeouts and bad LUNs. I'm baffled as to what the cause is, its not the errors because they happen all the time and the corruption only happens on average once every 1 1/2 months. Any Ideas?? anymore information needed i have it.

4 replies

by mckaytech

I'd be very suspicious of the drive array itself. The causative event may be something like re-setting the archive bit after a backup, but if your array is healthy, it should take that in stride.
Hence my suspicion...

If your RAID controller does not have a battery backup on it, I think I would probably first try disabling write-caching and make sure the firmware is up to date.

As far as the tape drive, SCSI timeouts are very common with tape drives but LUN errors should not be so theremay be something going on there also.

Are there any details about the corruption itself you could share? How does it show up (at the "sector not found" level or is it an application error)?

paul

by deathgod

The corruption shows up first in the event log posted by the backup software. When you try to access the corruption in Explorer NT won't let you of course but when you restart the server it runs autochk and "fixes" the corruption. I assume our Array is healthy because the System drive is on the same array, but that never gets corrupted.

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