[Bug-tar] tar fails in script

[Joe Miazga]

I recently downloaded version 1.15.1 and tried it in this simple script:
#!/bin/bash
mtx -f /dev/sg0 unload
mtx -f /dev/sg0 load 2
echo "In slot2"
cd /home/rlxsbr1/h/DCS/2004/09/09/flight004/
sleep 5
/usr/local/bin/tar cvf /dev/st0 pass068

it works fine from the command line but when I try to run it in the 
script I get the following error

Unloading Data Transfer Element into Storage Element 1...done
In slot1
./pass068/
./pass068/SBR_.0468L0000.hh00.hydra
/usr/local/bin/tar: /dev/st0: Cannot write: Input/output error
/usr/local/bin/tar: Error is not recoverable: exiting now

The previous tar version gave me the following errors

Unloading Data Transfer Element into Storage Element 2...done
In slot2
pass068/
pass068/SBR_.0468L0000.hh00.hydra
tar: /dev/st0: Wrote only 0 of 10240 bytes
tar: Error is not recoverable: exiting now

I'm using redhat ent 3 and the /home/rlxsbr1/h/DCS/2004/09/09/flight004 
is a NFS mount point.
Is this a bug?
Thanks
Joe Miazga
address@hidden