samba - Apr 1999 - Redhat 5.2, Samba 2.0.3 and Big Tapes

I have recently upgraded to Redhat 5.2 and Samba 2.0.3 and now our
backup is only going so far (uses smbclient to tar to tape) and
reporting no more room on device, I estimate it is hitting the problem
at around 5-6Gb - as its a 25Gb tape and has worked fine on older
versions of redhat/samba I think the tape is ok. 

Has any one any ideas or suggestions on what to try ?

Many Thanks

Ian

ian.harper@vaisala.com