On Monday 26 March 2007, FL wrote: >On 3/26/07, Gene Heskett <[EMAIL PROTECTED]> wrote: >> On Monday 26 March 2007, FL wrote: >> >Executive summary: >> >mt status works if no tape is loaded! > >... > >> >Then I created a new initial ram disk with >> > >> > >> >mkinitrd /boot/initrd-2.6.9-42.0.10.ELsmpLUN.img 2.6.9-42.0.10.ELsmp >> > >> >and modified /boot/grub/menu.lst accordingly. >> > >> >But nothing sort of worked until I located the SCSI terminator. >> >> This is very important. Missing or improper terms has caused the >> wasted sacrifice of lots of virgins over the last 30 or so years we've >> had a scsi spec. Few people understand that this is in fact a >> transmission line, and as such it _must_ be terminated at both _ends_ >> of the physical cable. > >Yes, I was actually well aware of this (it was kind of a joke -- I even >have a ham license). >It is crucially important to terminate the SCSI bus, but sometimes a >person's SCSI >terminator falls off, and one proceeds anyway. I probably should have >omitted >these remarks, but now that I've broadcast it to the entire world, it > will be held against me. > > > Using the next connector on the cable, and leaving another foot > >> or so curled up and unused at the end will cause data trashing echo's >> and cost you any religion you may have thought you had. > >In that case, I owe the world a religion. > >> I'm wondering if RHEL has continued the practice of only scanning the >> scsi bus for LUN=0, in which case many libraries and changers will be >> missed. >> >> This requires a rebuild of the kernel, with the 'scan all luns' set to >> 'y' in the scsi menu. > >AHA (behold the last line): > >[EMAIL PROTECTED] 2.6.9-42.0.10.EL-smp-i686]# grep SCSI .config >CONFIG_CISS_SCSI_TAPE=y >CONFIG_BLK_DEV_IDESCSI=m ># SCSI device support >CONFIG_SCSI=m >CONFIG_SCSI_PROC_FS=y ># SCSI support type (disk, tape, CD-ROM) >CONFIG_SCSI_DUMP=m ># Some SCSI devices (e.g. CD jukebox) support multiple LUNs ># CONFIG_SCSI_MULTI_LUN is not set > >Oh well. I figured it would come to this. > Chuckle, aww, come on its not that bad, its been months since I ran a fedora kernel. I bleed a little for the cause occasionally. :-) > >I would however, scan the /var/log/dmesg file to see if /dev/nst2 is the > >> correct address for the tape drive, which may not be the same as the >> changer robot you are running with the mtx command. You're use >> of /dev/sg4 to address the robot, but /dev/nst2 for the drive looks >> like something I'd want to check. > >Here is an additional piece of information (what I call a factlet: a > crucial fact that >you need to know that no one will tell you unless you ask): > >I have another SCSI card to which my spectra logic 2K is attached. >Drives 0 and 1 of the 2K are nst0 and nst1, respectively. The Exabyte > drive is nst2. > >[EMAIL PROTECTED] 2.6.9-42.0.10.EL-smp-i686]# cat /proc/scsi/scsi >Attached devices: >Host: scsi0 Channel: 00 Id: 00 Lun: 00 > Vendor: SONY Model: SDX-300C Rev: 04c7 > Type: Sequential-Access ANSI SCSI revision: 02 >Host: scsi0 Channel: 00 Id: 01 Lun: 00 > Vendor: SONY Model: SDX-300C Rev: 04c7 > Type: Sequential-Access ANSI SCSI revision: 02 >Host: scsi0 Channel: 00 Id: 02 Lun: 00 > Vendor: SPECTRA Model: 215 Rev: 2201 > Type: Medium Changer ANSI SCSI revision: 02 >Host: scsi1 Channel: 00 Id: 06 Lun: 00 > Vendor: HP Model: Ultrium 2-SCSI Rev: S33U > Type: Sequential-Access ANSI SCSI revision: 03 >Host: scsi1 Channel: 00 Id: 06 Lun: 01 > Vendor: EXABYTE Model: MAGNUM 224 Rev: C118 > Type: Medium Changer ANSI SCSI revision: 04 >[EMAIL PROTECTED] 2.6.9-42.0.10.EL-smp-i686]# > >And, > >[EMAIL PROTECTED] 2.6.9-42.0.10.EL-smp-i686]# dmesg | grep -A 1 -B 4 EXABYTE > >(scsi1:A:6): 160.000MB/s transfers (80.000MHz DT, 16bit) > Vendor: HP Model: Ultrium 2-SCSI Rev: S33U > Type: Sequential-Access ANSI SCSI revision: 03 > Vendor: EXABYTE Model: MAGNUM 224 Rev: C118 > Type: Medium Changer ANSI SCSI revision: 04 >[EMAIL PROTECTED] 2.6.9-42.0.10.EL-smp-i686]# > >-- > >> Cheers, Gene >> "There are four boxes to be used in defense of liberty: >> soap, ballot, jury, and ammo. Please use in that order." >> -Ed Howdershelt (Author) >> Everything that you know is wrong, but you can be straightened out. > >Many thanks!
-- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Life's the same, except for the shoes. - The Cars
