>> # date; dd if=/dev/zero of=/dev/nst1 bs=2048k count=10240; date
>> Thu May 22 13:09:47 EDT 2008
>> 10240+0 records in
>> 10240+0 records out
>> 21474836480 bytes (21 GB) copied, 245.657 seconds, 87.4 MB/s
>
> Bweare that testing from /dev/zero might not give a realistic result if the
> drive has compression switched on, because the phyical tape will hardly move.
> It will test the interface card's speed nicely :-)
>
Yes this is very important. What I have done to solve that on my
systems is use the hard drive or raid device directly. /dev/sda  or
/dev/md0 work well and for my LTO2 system I get 35MB/s to 40MB/s. This
assumes you have real data on the hard drive.

John

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