SCSI tape problem

[Peter Skensved]

	I tried posting this to the redhat-list but have not got any responses
yet so I will try it here  : 

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 After having upgraded from 5.1 to 5.2 I can no longer position tapes on our
two SCSI tapedrives using the mt utility. We have an Exabyte 8505 and a 
Quantum DLT-4000 on an Adaptec 2940 controller ( aic7xxx driver ) in a P-II.
Commands like mt -f /dev/nst0 fsf 2 return immidiately ( without any errors )
but there is no tape movement. Only the `rewind' and the `offline' commands do
something. Reading and writing tapes using tar works fine. The problem
is not the mt binary itself since it does not matter whether I use the 5.1 
( mt-st v 0.4 ) or the 5.2 version ( mt-st v 0.5 ).

 The positioning commands all worked with 5.1 ( up to and including the 2.0.35
kernel ) but fail with any of the 5.2 kernels including the latest 2.0.36
( dec8/98 ). 

 st.c appears to be the same for the two kernels ( .35 and .36 ) but the
underlying aic7xxx driver is quite different. 
 
  If anybody else has experienced similar problems or have suggestions I would
appreciate hearing from the.


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  Some additional information : RedHat 5.2 uses version 5.1.4 of the aic7xxx
driver. RedHat 5.1 used 5.0.19 ( I think )

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Peter Skensved                          Email : peter at SNO.Phy.QueensU.CA
Dept. of Physics,                       Phone:  (613) 545-2676
Queen's University,                     Fax:    (613) 545-6813
Kingston, Ontario,                      http://sno.phy.queensu.ca
Canada




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