On Friday 24 January 2003 12:11, Jean-Francois Malouin wrote: >Hello, > >* Martin Oehler ([EMAIL PROTECTED]) [20030124 11:52] thus spake: >> Hi, Jon! >> >> Am Fre, 2003-01-24 um 16.27 schrieb Jon LaBadie: >> > Maybe you hit what Gene describes in another posting today. >> > Once a tape has been written to with HW compression, the drive >> > senses it and automatically switches to HW compression >> > regardless of settings. >> >> No, I made a mistake (see my reply to Genes posting). >> >> > What capacity were you expecting for "native", uncompressed >> > data? >> >> I expect 100 GB. The drive specifications can be found at: >> http://www.storage.ibm.com/hardsoft/tape/3580/prod_data/g225-685 >>4.html We use the internal version of the drive. >> >> > According to docs/TAPETYPE: >> > >> > The speed is currently unused. >> > >> > Is this an HP drive by any chance? ISTR they have some >> > auto-slowdown system to match scsi-bus speed. >> >> # cat /proc/scsi/scsi >> Attached devices: >> Host: scsi1 Channel: 00 Id: 04 Lun: 00 >> Vendor: HP Model: Ultrium 1-SCSI Rev: N23D >> Type: Sequential-Access ANSI SCSI revision: >> 03 >> >> If the measured size and filemark is correct, do you have an >> idea how I will be able to use the drive with 15MB/sec? > >That all depends on your scsi or FC controller and pci bus. > >I have 4 Seagate LTOs in a STK_L40 library connected to > differential scsi controler -- one for each drive. diff scsi > because of cabling issues: LVD is a little less sturdy than > differential scsi but that's besides the point. I have an O3800 > so I can shove 60MBs doen its throat no problem. In your case you > have to ask yourself: is my pci bus wide and fast enough to > sustain 15MBs? > >Here's my tapetype for my Seagate Ultrium: > >define tapetype Ultrium-SGT-LTO { > comment "just produced by tapetype program" > length 101376 mbytes > filemark 0 kbytes > speed 15084 kps > lbl-templ >} > Thats a bit odd for what is supposed to be the same (geneticly speaking) drive. I'm noteing that Martins drive claimed it needed a 545 kilobyte filemark. That, to me with zero experience with either drive, still seems highly excessive.
Comments anybody? -- Cheers, Gene AMD K6-III@500mhz 320M Athlon1600XP@1400mhz 512M 99.22% setiathome rank, not too shabby for a WV hillbilly