> John -- I'd be grateful for your comments on how best to do a dd based
> read and write test for LTO3 and LTO4 tapes. This seems like a fairly
> good way of narrowing down a drive or interconnect problem.
>
> Is something like the following correct?
>
>    mt -f /dev/nst0 rewind
>    dd if=/dev/sd<x> of=/dev/nst0 bs=64512 count=10000 # about 300GB
>    mt -f /dev/nst0 rewind
>    dd if=/dev/nst0 of=/dev/null bs=64512
>

Looks fine to me. Its good that you are testing with data from a
source other than zeros so you are writing realistic data to the tape.

John

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