Very Computer

System Board:
Gigabyte GA 586 S2 512k cache SIS chipset.

Processor:
Cyrix 6X86 MX pr233 with ball bearing fan.

Memory:
1 stick 64mb PC66 DIMM
2 sticks 16mb EDO SIMM

Video:
Epoch S3 chipset PCI 2mb

Sound:
None (It is a sever after all)

Network Cards
eth0 PCI NE2000 compatible. 10/100 mbpsManufacturer unknown.
eth1 PCI Thomas Conrad TC5048 DEC 41080 (Tulip) 10BaseT for ADSL
adapter.

SCSI Controller:
Adaptec AHA 2940 UW PCI.

narrow side to side but thick top to bottom with a taper top to bottom.

type. Hewlett Packard SCSI CD Recorder model 6020 (?) with same
connector. IBM 4X SCSI CDROM wtih cable that looks like a VERY wide IDE
cable.

Floppy:
Mitsumi 3.5" 1.44mb floppy drive.

Modem:
AmJet ISA 56KFlex V. 90 modem (honest to God hardware modem.)

Keyboard, mouse, etc...
Generic U.S. 104 key, Shuttle Spacewalker 3 button serial mouse on
Windows com 1, Video out to shared monitor with Red Hat 6.1 workstation.
(accomplished via a VGA A/B data switch). NO PRINTER YET.

I can figure out the bios setting on the board to boot to SCSI and all,
but how to I set the SCSI ID? What is the SCSI id exactly? Is there
anything special about installing from SCSI on Red Hat 6.0? Since I have
devices on the two different ports on the controller how should I set
the ID?
Like I said I know very little about SCSI.

Quote:> IBM 4X SCSI CDROM wtih cable that looks like a VERY wide IDE
> cable.

Quote:> Floppy:
> Mitsumi 3.5" 1.44mb floppy drive.
> I can figure out the bios setting on the board to boot to SCSI and all,
> but how to I set the SCSI ID? What is the SCSI id exactly? Is there
> anything special about installing from SCSI on Red Hat 6.0? Since I have
> devices on the two different ports on the controller how should I set
> the ID?
> Like I said I know very little about SCSI.

the host adapter is typically ID 7.  this is adjustable in the 2940uw
bios (but you probably won't want to fiddle with this setting).  you
can also set the scsi ID of the boot device.  by default this is ID
0.  change this to 6 (since 6 has a higher scsi bus priority than 0).

you can set the ID of the hard disk, cd-r and cd-rom by jumpers on
those devices.

set the hard drives to ID 5 and 6 and the cd-r to 4 and the cd-rom to
3.  leave the adapter at 7.  any ID can occur at any phyical point in
the scsi bus, i.e., you can put the hard drive with ID 6 at any of the
connector on the scsi cable and it will still be ID 6.

the cd-rom has a 50 pin "narrow" scsi connector (it's physically wider
than the 68 pin "wide" connector).

the other devices use the 68 pin wide connection.

you will need to terminate the physical ends of the scsi cable.

some resources:

<URL:http://www.scsifaq.org/>

<URL:http://www.cablemakers.com/>

how are you going to arrange cabling?

assuming everything is internal, here are two setups

1) a long wide cable with a 68/50 adapter for the cd-rom (probably
   easiest/cheapest)  you will use only the 68 pin connector of the
   2940uw.

   +- 2940uw  (terminate auto -or- high on, low on)
   |
   |  <--- 68 pin ribbon with at least 5 drops
   |
   +--(68/50)--- cd-rom
   |     ^
   |     an adapter
   |
   +- cd-r
   |
   |
   |
   +- hard disk 1
   |
   |
   |
   +- hard disk 2 (terminate)

2) a long wide cable and a narrow cable
   you use both 50 and 68 pin connectors off the 2940uw

      cd-rom (terminate)
        |
        |  <-- 50 pin ribbon
        |
   +- 2940uw  (terminate auto -or- high on, low off)
   |
   |  <--- 68 pin ribbon with at least 5 drops
   |
   |
   +- cd-r
   |
   |
   |
   +- hard disk 1
   |
   |
   |
   +- hard disk 2 (terminate)

you can place the components along the bus in arbitrary order.
termination is a physical/electical thing and should happen at the
*physical end* of the cable.

i hope this helps.  the scsi faq will cover this and more.  feel free
to ask more questions if these don't make sense.

--
J o h a n  K u l l s t a m

Don't Fear the Penguin!

Quote:

> set the hard drives to ID 5 and 6 and the cd-r to 4 and the cd-rom to
> 3.  leave the adapter at 7.  any ID can occur at any phyical point in
> the scsi bus, i.e., you can put the hard drive with ID 6 at any of the
> connector on the scsi cable and it will still be ID 6.

Quote:> the cd-rom has a 50 pin "narrow" scsi connector (it's physically wider
> than the 68 pin "wide" connector).

Quote:> *how are you going to arrange cabling?

> 2) a long wide cable and a narrow cable
>    you use both 50 and 68 pin connectors off the 2940uw

>       cdrecorder  (terminate via jumper setting on drive)
>       cd-rom
>         |
>         |  <-- 50 pin ribbon
>         |
>    +- 2940uw  (terminate auto -or- high on, low off)

Okay now assuming that I need a physical terminator on the wide cable and the
terminator on the drive works right (I have heard from several sources that
the 50 pin devices can and do use device based termination) assuming I get
this to work. What kind of stategy should I use to get Red Hat to recognize
and use all of the drives?

Quote:> > the cd-rom has a 50 pin "narrow" scsi connector (it's physically wider
> > than the 68 pin "wide" connector).
> I am assuming (Since it fits) that the CDRecorder is the same and it
> is set at 4. The CDplayer is set at 2
> The boot hard disk is now set to 1 (9.1gb IBM) (/dev/sda*) the second hard
> disk is set to 3 (the other 9.1) and the third (4.5 GB) is set to 5.

Quote:> > *how are you going to arrange cabling?

> > 2) a long wide cable and a narrow cable
> >    you use both 50 and 68 pin connectors off the 2940uw

> >       cdrecorder  (terminate via jumper setting on drive)
> >       cd-rom
> >         |
> >         |  <-- 50 pin ribbon
> >         |
> >    +- 2940uw  (terminate auto -or- high on, low off)

>       |
>       |
>       |
>       |
>       +- IBM 9.1 GB hard disk ID#0
>       |
>       |
>       |
>       |
>       |
>       +- IBM 9.1 GB hard disk ID#3
>       |
>       |
>       |
>       |
>       +- IBM 4.5 GB hard disk ID#5 (term I think ( jumper on the back of the
> drive))

Quote:> Okay now assuming that I need a physical terminator on the wide cable and the
> terminator on the drive works right (I have heard from several sources that
> the 50 pin devices can and do use device based termination) assuming I get
> this to work.

Quote:> What kind of stategy should I use to get Red Hat to recognize
> and use all of the drives?

thus your hard drives will be
/dev/sda (9.1G id 0)
/dev/sdb (9.1G id 3)
/dev/sdc (4.5G id 5)
this is useful for selecting your partitioning scheme

the cd rom and writer will get devices too.  one will get called
/dev/cdrom and the other /dev/cdrom1.  get the cdrecord program and
read the howto.  you may need/want to rename the devices.

hope this helps.  let me know how it goes.

--
J o h a n  K u l l s t a m

Don't Fear the Penguin!