>I'm searching for the tapetype of the following LTO-drive:
>  HP Ultrium 1-SCSI
>
>It has a capacity of 100/200 GB. I couldn't find an entry
>in the FAQ-O-Matic about this.

If you know the capacity, you already have enough to make a "close enough"
guess at a tapetype:

  define tapetype HP_Ultrium_1 {
    # Based on manufacture spec of capacity.
    filemark 0
    speed 1
    length 100 GB
  }

The speed value is not used.  And unless you have a bajillion dump
images, the filemark value is not all that important on this large a
capacity device.  Unless you are just the terminally curious type :-),
save yourself the time that running (am)tapetype will take.

FYI, amtapetype is just a renamed version of tapetype -- same program,
same options, although at some point, [-b blocksize] was added.

>I used the device
> /dev/nrmt0
>so I think this should be without hardware compression (Linux).

I don't think so.  Based on what I know of Linux (which is minimal),
I'm pretty sure you need to use the "mt" command to disable compression.
Something like "mt -f /dev/nrmt0 compression off".

Some OS's (e.g. Solaris) use the device name to control density and
compression.  Linux does not (I don't think).

>Martin Öhler

John R. Jackson, Technical Software Specialist, jrj AT purdue DOT edu