On Friday 24 January 2003 11:11, Martin Oehler wrote: >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. > Odd. You must have a different version of mt than I. Mine is silent when it does accept the keyword, but doesn't even recognize the datcompression keyword, spitting out its help screen instead. I have mt-st version 0.7
>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. Pretty ancient by now. You might try the last 2.4.3-datestring snapshot from Jean-Louis's site at umontreal. The link is near the bottom of the page at amanda.org. Bookmark it. I've been running the last snapshot from there, usually within a day of its release for > year without any surprises I couldn't live with. But speed isn't somethng I can check as my dds2 changer can only do 400kps & that doesn't certainly doesn't strain anything except my patience. :( -- Cheers, Gene AMD K6-III@500mhz 320M Athlon1600XP@1400mhz 512M 99.22% setiathome rank, not too shabby for a WV hillbilly