Martin Sanborn <[EMAIL PROTECTED]> writes: > On Monday 12 November 2001 05:01 pm, Philippe Troin wrote: > > Martin Sanborn <[EMAIL PROTECTED]> writes: > > > How do I turn on the data compression? The mt man page indicates that > > > > > > mt -f /dev/tapes/tape0/mtn datcompression [x] > > > > mt datcompression 1 (default) reports the current state > > mt datcompression 0 turns it off > > mt datcompression 2 turns it on > > Unfortunately, the command mt -f [device] datcompression 2 returns > > Compression off. > Compression capable. > Decompression capable. > > I retried dump again just in case it wasn't reporting the compression as on, > but still the same behavior (a little less than 4GB on the tape).
Really odd. > > You might also want to investigate the mt-st package which should give > > you more control on SCSI tape behavior. > > That one doesn't want to talk to me. I installed it, and I used the command > "mt-st -f [device] defcompression". While the tape spins, when it stops it > returns nothing. I tried appending a 0,1, or 2 to the end of the command, but > it still returns nothing. > > Again, I tried dump after using the "mt-st defcompression 2" > command, and the result is still the same. Puzzling. Have you simply tried "mt-st -f <device> compression 1" ? What does mt-st prints when you reboot and/or install the st module ? Mine says: st0: Mode 0 options: buffer writes: 1, async writes: 1, read ahead: 1 st0: can bsr: 1, two FMs: 0, fast mteom: 0, auto lock: 1, st0: defs for wr: 1, no block limits: 0, partitions: 1, s2 log: 1 st0: sysv: 0 st0: Default block size set to 0 bytes. st0: Compression default set to 1 Phil.
