Thanks for all the help. I had given a command
"amtapetype -e 400g -f /dev/nst0" before leaving for
the day yesterday. The output on the console I find
today is 

Writing 4096 Mbyte   compresseable data:  44 sec
Writing 4096 Mbyte uncompresseable data:  79 sec
WARNING: Tape drive has hardware compression enabled
Estimated time to write 2 * 409600 Mbyte: 15800 sec =
4 h 23 min
wrote 12320768 32Kb blocks in 94 files in 5669 seconds
(short write)
wrote 12386304 32Kb blocks in 189 files in 6033
seconds (short write)
define tapetype unknown-tapetype {
    comment "just produced by tapetype prog (hardware
compression on)"
    length 386048 mbytes
    filemark 0 kbytes
    speed 67623 kps

As shown, it has "hardware compression on". As per the
suggestions received in reply to my email, the
"hardware compression" should be set to "off". I will
find out how to do this and again give the command
today and the forward the output to the mailing list
in the evening today.

Thanks

Yogesh 

--- Paul Bijnens <paul.bijnens AT xplanation DOT com> wrote:

> Yogesh Hasabnis schreef:
> > Hi All,
> > 
> > I would be grateful if anybody can forward me the
> > tapetype definition for an HP Ultrium 960 LTO3
> tape
> > device (external). The SCSI controller used is an
> HP
> > 374654-B21 - 64-bit Single Channel Wide Ultra320
> SCSI
> > Controller. Basically, on what factors does the
> > tapetype deifintion depend? Else if I need to give
> the
> > amtapetype command is the command "amtapetype -t
> > /dev/nst0" sufficient? Or do I need to specify
> > additional arguments to the command? How much time
> > will this command take?
> 
> See:
> 
>
http://wiki.zmanda.com/index.php/Tapetype_definitions#LTO_Ultrium_3_with_400.2F800_Gbyte_tapes
> 
> When running amtapetype, please do add a reasonable
> estimate value:
> 
>    amtapetype -e 400g /dev/nst0
> 
> In that case, it will give an estimate of the total
> runtime
> after a few minutes, usually 4-8 hours.
> 
> 
> -- 
> Paul Bijnens, Xplanation                           


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