How to activate the datacompression at SCSI-DAT-Streamer HP C1533A ??
Dear Debian-Community,
meanwhile I found out, that the datacompression at
HP C1533A-DAT-Streamer obviously isn't to activate.
That means, the tar-saving at DDS2-120m-DAT-tape stops
after ca. 3,5 GByte.
It makes no sense, if the datacompression is activated by the
DIL-switches 1 and 2 at the streamer or to do that by
mt -f /dev/st0 datcompression 1.
There is no difference too, if the Media Recognition System is active
or not (DIL-switch 3).
tar -R counts the written blocks a 512 Byte.
After end of medium are
7167695 blocks a 512 Bytes written.
These are ca. 3,66 GByte.
Furthermore, is there given no documentation about
the DIL-switches 4 to 8 of this streamer,
I couldn't find for that anything,
according to LINUX ?
In devices.txt in /usr/src/linux/Documentation are no
declarations about "modes",
st0 mode0
st0l mode1
st0m mode2
st0a mode3
Do you know, what they mean?
If I do according to
/dev/st0l or
/dev/st0m or
/dev/st0a
mt -f <Device> status
the the system answers: "Device not configured!"
Is there generally no datacompression-support given
for /dev/st0-drivers according to DDS2-SCSI-streamers?
And what is to configure for st0a, l oder m switching on
effectively the datacompression at DAT-streamers?
Anyone experienced how to switch on the
datecompression at HP C1533A-Streamer with Linux ?
Many thanks,
Christoph Walther
mailto:christoph.walther@t-systems.de
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