I use tar frequently to backup lots of machines on a LAN, and generally
there are no problems except when writing to the tape drive.  In fact I
have two of the same tape drive on two different machines, they are
Seagate TapeStor ATAPI 4G drives.  I've had the drives choke on large
files, typically over 5M.  They choke more often when I use the z option
to tar.  And when I try to backup an nfs mounted partition it always dies
and locks up with an I/O error, but not necessarily on large files, it
seems to choke at random here.  I have plenty of tapes, I don't think it's
a bad tape problem, and it happens on both drives.  I don't think it's a
tar problem since I can backup to a hard drive with no problems. 

Is this some kind of timing issue with the drive?

Here are the error messages:

Nov 23 14:33:22 gilmour kernel: ide-tape: hdc <-> ht0, 600KBps, 14*26kB 
buffer, 2600kB pipeline, 190ms tDSC 
Nov 23 14:42:32 gilmour kernel: ide-tape: ht0: I/O error, pc =  a, key =  
2, asc =  4, ascq =  2 
Nov 23 14:42:34 gilmour last message repeated 200 times
Nov 23 14:42:34 gilmour kernel: ide-tape: ht0: I/O error, pc = 10, key =  
2, asc =  4, ascq =  2 
Nov 23 14:42:34 gilmour kernel: ide-tape: Couldn't write a filemark 
Nov 23 14:42:34 gilmour kernel: ide-tape: ht0: I/O error, pc =  1, key =  
2, asc =  4, ascq =  2 
Nov 23 14:55:27 gilmour kernel: ide-tape: ht0: I/O error, pc = 34, key =  
3, asc = 31, ascq =  0 
Nov 23 14:55:27 gilmour kernel: ide-tape: ht0: I/O error, pc =  1, key =  
3, asc = 31, ascq =  0 
Nov 23 14:55:27 gilmour kernel: ide-tape: ht0: I/O error, pc =  1, key =  
3, asc = 31, ascq =  0 
Nov 23 14:55:35 gilmour kernel: ide-tape: ht0: I/O error, pc = 34, key =  
3, asc = 31, ascq =  0 


/**********************************/
/*  Eric H. Majzoub               */
/*  Graduate Researcher           */
/*  Washington University         */
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