Hello Gene,

Would a variant like this:

        /usr/sbin/mtx load 1 0;
        /usr/bin/mt -f /dev/st0 compression 0;
        /usr/bin/mt -f /dev/st0 setblk 524288;
        /usr/bin/dd if=/dev/zero of=/dev/st0 bs=512k count=1;
        su amandabackup -c "/usr/sbin/amlabel -f Monthly-LTO7 000321L7 slot 1";
        /usr/sbin/mtx unload 1 0;

work?

During my tests with this, the hardware compression stays disabled when I load a new tape.

Thanks!


On 2018-01-11 10:51 PM, Gene Heskett wrote:
1. rewind the tape.
1a. Do NOT remove tape from drive, or cause it to read the tape other
than what I write here until after step 5.
2. read the label out to a 32k file.
3. rewind the tape.
4. Turn the compression off, probably with mt.
5. Immediately re-write that label while the tape is rewound, and the
hidden tape id block in front of the label will get rewritten too, with
that compression flag off.

--
Luc Lalonde, analyste
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Département de génie informatique:
École polytechnique de MTL
(514) 340-4711 x5049
luc.lalo...@polymtl.ca
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