Backup to SCSI tape drive stops at point it is going to write a file

I have a SCO OpenServer 5.0.6 system running BackupEdge software with a Quantum Model # STD2401LW DAT Tape drive and Adaptec SCSI Card 29160.  All of a sudden when doing a full system backup the backup stops when it reaches a file that actually has data in it.  
I tried changing the tape drive to another same model, I tried changing the SCSI card to another with same model, and I tried changing the board to another slot on the motherboard.  None of those things work.  It keeps doing the same thing.
foxhelpAsked:
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DavidPresidentCommented:
It has GOT to be logging an error somewhere.  Root cause could be so many things that it is just pointless to start naming all possibilities.

What does /var/log/messages  (or /var/adm/messages (cant' remember what SCO uses)

Have you tried just doing backups with tar to see if problem has to do with your backup software?  This would tell you if you have a read error on an input file also ..

tar cvf /dev/rmt/0mn /usr   (Substitute tape device, I jus used /usr as a directory for testing, best to use the directory that has the file(s) you want to backup).
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foxhelpAuthor Commented:
It is not even logging an error from BackupEdge.  It just stops and hangs forever at the file when I look at the backup file that is created.
/usr/adm/messages and /usr/adm/syslog do not show any errors.
I will try tar.
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mikelfritzCommented:
How big is the file it stops on?  

Also, post the output of "dfspace" to see how much data you are trying to backup to the tape - it supports 20G native, 40G with hardware compression.  

You can look at your BackupEdge settings, using Edgemenu, to see that you are not doing both hardware and software compression.

After this you could try to use backupedge to backup just the offending file - if that fails, then maybe an fsck is in order on the filesystem containing the offenfer; Might want to dd, or some other copy of the files before an fsck.
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mikelfritzCommented:
Also - the offending file may be the next file - not the one it is listing...
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DavidPresidentCommented:
It typically displays the file AFTER it has been written, so if there is a read error it will almost always be a different file. You need to look at the system logs to determine what file had a read problem (if any)
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mikelfritzCommented:
I thought I said that - maybe not quite clear enough - sorry.
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mikelfritzCommented:
Also - with SCO I think the logs are under /var/adm/*
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foxhelpAuthor Commented:
One thing I forgot to mention and don't know if it makes a difference is that I can get a full listing of the contents of the tape and I can read the label so the reading part of it is working.  What is not working is writing to the tape.
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foxhelpAuthor Commented:
Here is the output of dfspace...
# dfspace
/         :     Disk space: 71736.42 MB of 75778.38 MB available (94.67%).
/stand    :     Disk space:   6.16 MB of  14.99 MB available (41.10%).

Total Disk Space: 71742.59 MB of 75793.38 MB available (94.66%).
Here is the result of the tar, it got stuck for hours after the second file.  Once this happens, I cannot kill the tar process or stop it in any way.  The only way is to reboot and remove the tape.
#tar cvf /dev/rStp0 /usr/aph
a /usr/aph/.profile 9 tape blocks
a /usr/aph/db/TBOCDT 27824 tape blocks

ONLY doing software compresses on BackupEdge not both.
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foxhelpAuthor Commented:
Thanks for having me try different things.  The problem was the SCSI cable.  It is working now.

Thanks,
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