Re: Basic SCSI question
On %M 0, Randy Edwards wrote
> I don't have any experience with Linux and SCSI drives and was wondering if
> someone could give me some basic-level/newbie pointers on SCSI setup.
>
> The computer has an AdvanSys card in it and I've recompiled the kernel with
> advansys, generic SCSI, and SCSI CD-ROM support. This seems okay as dmesg
> reports:
> scsi0 : AdvanSys SCSI 3.1E: PCI Ultra-Wide: BIOS C8000/7FFF, IO E800/3F, IRQ
> 10
> scsi : 1 host.
> Vendor: YAMAHA Model: CRW4416S Rev: 1.0f
> Type: CD-ROM ANSI SCSI revision: 02
> Detected scsi CD-ROM sr0 at scsi0, channel 0, id 2, lun 0
> Vendor: IBM Model: DDRS-39130D Rev: DC1B
> Type: Direct-Access ANSI SCSI revision: 02
> Detected scsi disk sda at scsi0, channel 0, id 6, lun 0
> scsi : detected 1 SCSI cdrom 1 SCSI disk total.
> sr0: scsi3-mmc drive: 16x/16x writer cd/rw xa/form2 cdda tray
> Uniform CDROM driver Revision: 2.54
> SCSI device sda: hdwr sector= 512 bytes. Sectors= 17850000 [8715 MB] [8.7 GB]
>
> Similarly, a cat of /proc/scsi/scsi reports:
> Attached devices:
> Host: scsi0 Channel: 00 Id: 02 Lun: 00
> Vendor: YAMAHA Model: CRW4416S Rev: 1.0f
> Type: CD-ROM ANSI SCSI revision: 02
> Host: scsi0 Channel: 00 Id: 06 Lun: 00
> Vendor: IBM Model: DDRS-39130D Rev: DC1B
> Type: Direct-Access ANSI SCSI revision: 02
>
> An output of "cat /proc/devices" reveals:
> Block devices:
> 2 fd
> 3 ide0
> 8 sd
> 11 sr
> 22 ide1
>
> That all looks okay (I guess) but I cannot access the devices. I did a
> /dev/MAKEDEV update and I have these devices in /dev:
> brw-rw---- 1 root disk 8, 0 May 18 22:59 sda
> brw-rw---- 1 root disk 11, 0 May 18 22:59 scd0
>
> If I try to do an "fdisk /dev/sda" I get a message of "Unable to read
> /dev/sda" along with:
> May 19 06:13:21 spartacus kernel: SCSI disk error : host 0 channel 0 id 6 lun
> 0 return code = 25040000
> May 19 06:13:21 spartacus kernel: scsidisk I/O error: dev 08:00, sector 0
>
> Similarly, a command of "mount /dev/scd0 /mnt" gives this info in
> /var/log/messages:
> May 19 06:13:21 spartacus kernel: SCSI disk error : host 0 channel 0 id 6 lun
> 0 return code = 25040000
> May 19 06:13:21 spartacus kernel: scsidisk I/O error: dev 08:00, sector 0
> May 19 06:15:35 spartacus kernel: sr00:00: old sense key None
> May 19 06:15:49 spartacus kernel: Non-extended sense class 0 code 0x0 <3>sr0:
> CDROM (ioctl) error, command: Start/Stop Unit 00 00 00 03 00
> May 19 06:15:49 spartacus kernel: sr00:00: old sense key None
> May 19 06:15:49 spartacus kernel: Non-extended sense class 0 code 0x0
> <6>cdrom: open failed.
> May 19 06:15:59 spartacus kernel: scsi : aborting command due to timeout : pid
> 55, scsi0, channel 0, id 2, lun 0 Prevent/Allow Medium Removal 00 00 00 00 00
> May 19 06:15:59 spartacus kernel: SCSI error: host 0 id 2 lun 0 return code =
> 25040000
> May 19 06:15:59 spartacus kernel: ^ISense class 0, sense error 0, extended
> sense 0
> May 19 06:16:09 spartacus kernel: scsi : aborting command due to timeout : pid
> 56, scsi0, channel 0, id 2, lun 0 Test Unit Ready 00 00 00 00 00
> May 19 06:16:09 spartacus kernel: SCSI error: host 0 id 2 lun 0 return code =
> 25040000
> May 19 06:16:09 spartacus kernel: ^ISense class 0, sense error 0, extended
> sense 0
>
> Any advice, RTFM pointers, or tips would be appreciated. I'm guessing I
> don't have the devices set up properly, but perusing docs and howtos didn't
> turn up anything. Thanks in advance.
>
> --
> Regards, | "A contribution by Microsoft Corporation to South Carolina's
> . | Republican Party during the 1998 campaign preceded a decision
> Randy | by the state's GOP attorney general to withdraw from an
> | antitrust suit against the computer software giant."
> | Source: API, 24 December 1998
>
>
> --
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>
It looks like the problem is with the SCSI chain itself, from the error
messages (not that I am an expert, but I've used an Advansys card
successfully).
There are a few things you can check/try:
- SCSI disk support & SCSI CDROM support are separate options to SCSI
support in recent kernels; double-check that you have them selected
in your kernel config.
- Make sure that termination is enabled on the devices at the two ends of
the cable (e.g., the card & the CDROM), but not on other devices; set the termination manually,
rather than using 'auto' termination, if possible;
- Make sure that the last device on each end of the SCSI cable is at the
end of the cable (i.e., no empty sockets at either 'end');
- Use the Advansys BIOS to set the SCSI buss speed low, in case one of both
devices can't keep up;
- Try replacing the SCSI cable;
- Make sure you are using a proper SCSI cable: SCSI has rules about how
far apart devices should be (there is a minimum required cable length
between devices, for instance); if you break these rules bad things will
happen.
- Try connecting each device individually, in case (e.g.) a dodgy CDROM is
making trouble for everyone;
- If you get the CDROM working but not the disk, try a low-level format on
the disk.
- Find a goat and some black candles.
Good luck,
John P.
--
huiac@camtech.net.au
john@huiac.apana.org.au
"Oh - I - you know - my job is to fear everything." - Bill Gates in Denmark
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