Juha Vuori wrote:
I understand that there should be a compression feature inside this tape
system.
According to Device Drivers, Features, and Commands - SC33-8289-04, it
could be activated in tape_3590 driver with
# mt -f /dev/rtibm0 compression 1
but "mt" in this distribution does not support "compression" command.
I've looked at the mt in my fedora installation, and it does'nt have
compression as well. You need something that ends up calling this one
[from /usr/include/linux/mtio.h]:
#define MTCOMPRESSION 32/* control compression with SCSI mode page 15 */
According to gnu.org, gnu mt does'nt support this call at all:
http://www.gnu.org/software/tar/manual/html_node/mt.html
You need to have the mt-st tool, which is an extended version of mt.
Try to install the mt-st rpm that comes with your distribution, it
should support --compression as stated above. Looks like we need to
update the documentation there.
so long,
Carsten
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