Hi! Am Fre, 2003-01-24 um 16.22 schrieb Gene Heskett: > On Friday 24 January 2003 08:53, Martin Oehler wrote: > >Why is the length the same? Seems like switching the compression > > modes with mt is not working. > > It was still on? You didn't say that you had turned it back off > above. Maybe this drive has a compression scheme like the DDS > drives do, whereby it records the compression status in a hidden > header, and resets it to match that tape when the tape is next > scanned at insertion. In which case see my rough outline of what > it takes to turn those flags off, in a previous message earlier > today.
I'm sorry, I made a mistake. The hardware compression was off all the time. :( # mt -f /dev/nrmt0 datcompression 0 Compression off. # mt -f /dev/nrmt0 datcompression 1 Compression off. I looked at IBMs ressources, but they offer drivers only for RedHat and older SuSE distributions, but I'm using SuSE 8.1 . Is it possible that the drive is that slow because I'm using native linux drivers? > >Additionally, I can't understand why the speed is that slow. The > > drive should write about 15 MB/sec without HC. Is it possible to > > ignore the measured speed and use the one from the datasheet of > > the tape? > > How fast is the interface? Maybe it can't to 15 megs a second, > older scsi stuff was hard pressed to do 5 megs, often less. Much > less. The interface is an Adaptec AIC-7899P U160. > >The used amanda version is amanda-2.4.3 . > > Which snapshot? It should have a date string after the 2.4.3. The newest entry inside the ChangeLog is 2002-10-07. Regards, Martin �hler
