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Bad backup

We have noticed that on a particular day, the backup to tapes gives us a problem displaying "archive failed - function write to tape failed code -1 errno 6." What could cause this? These tapes are new.

This problem could be caused by any number of hardware failures, including a bad SCSI card, a dirty tape drive, a bad cable or even a bad tape. (New tapes are not always a good thing.) I would try to backup to these tapes using tar or a similar utility. If that fails, then your troubleshooting list gets shorter. If it works, then your problem is probably most likely with the archive software.

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