On Fri, Jan 12, 2018 at 03:20:51PM -0500, Luc Lalonde wrote: > 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. > The critical event is whether it remains disabled after the amanda program opens the tape drive for reading (or R/W). All amanda programs that deal with the tape drive do a read of the tape header before doing anything else.
> 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 > ----------------------------- > Département de génie informatique: > École polytechnique de MTL > (514) 340-4711 x5049 > [email protected] > ----------------------------- >>> End of included message <<< -- Jon H. LaBadie [email protected] 11226 South Shore Rd. (703) 787-0688 (H) Reston, VA 20190 (703) 935-6720 (C)
