On Monday 26 March 2007, FL wrote:
>On 3/26/07, Gene Heskett <gene.heskett AT verizon DOT net> 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):
>
>[root@amanda 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.
>
>[root@amanda 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
>[root@amanda 2.6.9-42.0.10.EL-smp-i686]#
>
>And,
>
>[root@amanda 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
>[root@amanda 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
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