SCSI Tape Drive
Skot
Can anyone tell me how to configure an IBM, DDS4, DAT tape drive on
Channel 2 of SCSI Controller 0 (using 'makedev tape' usually)
Maybe I should be using a second controller, as I can't find any
documents on using multi-channel ones. If you know where these docs
are, please point me in the right direction.
Cheers.
Skot.
Scott McMillan
(All of the following is assuming Openserver 5.0.6 or above, as that
information was not provided. Also note: I DO NOT recommend placing
a tape drive onto any RAID controller!)
Not sure if I'm understanding the problem in the 2nd paragraph (a
dual-channel SCSI interface is handled as 2 SCSI interfaces using the
same driver/I-O/IRQ in most cases), but in 'mkdev tape' I would use:
"Enter the prefix of the SCSI host adapter that supports this device
or press <Return> for the default:"
Obviously depends on your exact HW config. Enter the
appropriate driver name for your SCSI card
"Which 'XXXX' SCSI host adapter supports this device?"
Where XXXX is whatever driver is running your SCSI interface
(from above) - On the 2nd channel you would answer 1
(zero being the first)
"What SCSI Bus is this device attached to?"
Answer 0 in most cases
"What is the Target ID for this device?"
Pretty obvious, whatever you have the tape drive jumpered to
Answer 0 (zero) to "What is the LUN of this device?" unless you have
an autoloader, in which case you will need to be more specific in your
definition of "an IBM, DDS4, DAT tape drive". In the future, please
be sure to include as many specifics as possible (OS & version,
hardware configuration, etc.)
Well, there you go, my 'step-by-step', for whatever that's worth.
Before you continue on down this road, you may want to take a walk
through Tony's site:
http://www.pcunix.com
Scott McMillan
Scott McMillan
Skot
Scott McMillan wrote:
>
> On Tue, 17 Jun 2003 23:02:46 GMT, Skot <sk...@canada.com> wrote:
>
> >Hello all,
> >
> >Can anyone tell me how to configure an IBM, DDS4, DAT tape drive on
> >Channel 2 of SCSI Controller 0 (using 'makedev tape' usually)
> >
> >Maybe I should be using a second controller, as I can't find any
> >documents on using multi-channel ones. If you know where these docs
> >are, please point me in the right direction.
> >
> >Cheers.
> >
> >Skot.
>
> (All of the following is assuming Openserver 5.0.6 or above, as that
> information was not provided.
Ah, yeah, OSR5.0.7, sorry, meant to mention that.
> Also note: I DO NOT recommend placing
> a tape drive onto any RAID controller!)
Don't think you could on this OS, doesn't seem to recognize the second
channel anyway. But why not anyway? What's the use of a second channel
if you shouldn't use it?
> Not sure if I'm understanding the problem in the 2nd paragraph (a
> dual-channel SCSI interface is handled as 2 SCSI interfaces using the
> same driver/I-O/IRQ in most cases)
That's what I would think, in most cases of most OSes, but doesn't look
like that here.
, but in 'mkdev tape' I would use:
>
<snip>
Yeah, many things tried, that was one, doesn't work, it's not the second
interface after all. Maybe someone knows how I can add the second
channel to look like a second interface to the OS.
BTW, 'sconf' does not show the second channel either. hmm...
> Well, there you go, my 'step-by-step', for whatever that's worth.
No need for step-by-step on makedev tape, it's quite self explanatory.
> Before you continue on down this road, you may want to take a walk
> through Tony's site:
> http://www.pcunix.com
Been there, done that. I don't see anything there, or in any other SCO
docs to do with second channel on SCSI controllers.
Thanks for trying.
If anyone knows of a TA or Tony doc, that deals with multi-channel SCSI
it would be much more appreciated than patronizing.
Cheers.
Skot.
Scott McMillan
>
>
>Scott McMillan wrote:
>>
>> On Tue, 17 Jun 2003 23:02:46 GMT, Skot <sk...@canada.com> wrote:
>>
>> >Hello all,
>> >
>> >Can anyone tell me how to configure an IBM, DDS4, DAT tape drive on
>> >Channel 2 of SCSI Controller 0 (using 'makedev tape' usually)
>> >
>> >Maybe I should be using a second controller, as I can't find any
>> >documents on using multi-channel ones. If you know where these docs
>> >are, please point me in the right direction.
>> >
>> >Cheers.
>> >
>> >Skot.
>>
>> (All of the following is assuming Openserver 5.0.6 or above, as that
>> information was not provided.
>
>Ah, yeah, OSR5.0.7, sorry, meant to mention that.
>
>> Also note: I DO NOT recommend placing
>> a tape drive onto any RAID controller!)
>
>Don't think you could on this OS, doesn't seem to recognize the second
>channel anyway. But why not anyway? What's the use of a second channel
>if you shouldn't use it?
Because RAID controllers are meant to control hard drives, and many
won't support tape/CD drives at all. Has nothing to do with the OS in
those cases.
So what is the model of this controller?
>
>> Not sure if I'm understanding the problem in the 2nd paragraph (a
>> dual-channel SCSI interface is handled as 2 SCSI interfaces using the
>> same driver/I-O/IRQ in most cases)
>
>That's what I would think, in most cases of most OSes, but doesn't look
>like that here.
>
>, but in 'mkdev tape' I would use:
>>
>
><snip>
>
>Yeah, many things tried, that was one, doesn't work, it's not the second
>interface after all. Maybe someone knows how I can add the second
>channel to look like a second interface to the OS.
Again, without knowing the exact make/model of your "multi-channel
SCSI" controller, any responses would likely be nothing more than
guesses.
>
>BTW, 'sconf' does not show the second channel either. hmm...
Maybe it's been disabled by the (controller/system) BIOS? I remember
many Dell systems that shipped with their embedded 29160 with the 1st
channel enabled, 2nd channel disabled.
>
>> Well, there you go, my 'step-by-step', for whatever that's worth.
>
>No need for step-by-step on makedev tape, it's quite self explanatory.
>
>> Before you continue on down this road, you may want to take a walk
>> through Tony's site:
>> http://www.pcunix.com
>
>Been there, done that. I don't see anything there, or in any other SCO
>docs to do with second channel on SCSI controllers.
>
>Thanks for trying.
>
>If anyone knows of a TA or Tony doc, that deals with multi-channel SCSI
>it would be much more appreciated than patronizing.
>
>Cheers.
>
>Skot.
Scott McMillan
Skot
Scott McMillan wrote:
>
> On Wed, 18 Jun 2003 15:02:43 GMT, Skot <sk...@canada.com> wrote:
>
> >
> >Scott McMillan wrote:
> >>
> >
> >> Also note: I DO NOT recommend placing
> >> a tape drive onto any RAID controller!)
> >
> >Don't think you could on this OS, doesn't seem to recognize the second
> >channel anyway. But why not anyway? What's the use of a second channel
> >if you shouldn't use it?
>
> Because RAID controllers are meant to control hard drives, and many
> won't support tape/CD drives at all. Has nothing to do with the OS in
> those cases.
Hmm... Makes sense, somewhat.
> So what is the model of this controller?
That's not so clear, it's an onboard thing, ServeRAID-4 Ultra 160 I
think, on a xSeries 225, Type 8647. Not that it matters, the question
was how to get the OS to recognize the second channel, the hardware is
setup fine.
> >
> >BTW, 'sconf' does not show the second channel either. hmm...
>
> Maybe it's been disabled by the (controller/system) BIOS? I remember
> many Dell systems that shipped with their embedded 29160 with the 1st
> channel enabled, 2nd channel disabled.
It's not Dell, it's IBM and the Controller is the first controller it
has 2 Channels and both channels are active, the second channel even
shows the tape drive connected.
Well, regardless, I'm putting a second controller on there, now I have a
choice between an Adaptec 29160n and a newer IBM PCI Ultra 160, both
apparently work with OSR5. Now how to add the second controller...
That, I've done before.
Thanks again.
Brian K. White
You are asking the wrong question.
If it's a raid controller, then often the actual hardware is hidden from
the OS and only virtual hardware is presented to the OS. You use the
second channel by plugging half of your drives on it (even if there is
only two drives total) and in the raid card's bios you reconfigure the
raid array to span both drives. The OS still only sees one drive on
channel "0"
Different raid cards use different schemes for showing the OS more virtual
drives after the first "0,0,0,0" drive.
In some cases you add another drive anywhere you want physically, any
channel, any scsi id, and to the OS that new drive just looks like
channel=0 id=0 lun=1
more often the lun is always 0 and the id increments with each new drive.
and sometimes there is an option to access a physical location by it's
real channel/id/lun as long as it doesn't happen to conflict with any
existing virtual drive.
You may have to tell the card's bios that a drive is there and that it is
active/enabled even though you don't configure it into some array, or you
may have to define an "array" that only has one drive. It might simply not
be possible to use a tape drive because as has been mentioned, sometimes
the raid card's bios simply only recognizes disk devices, not any old scsi
device. (/me contemplates an array of scanners...)
--
Brian K. White -- br...@aljex.com -- http://www.aljex.com/bkw/
+++++[>+++[>+++++>+++++++<<-]<-]>>+.>.+++++.+++++++.-.[>+<---]>++.
filePro BBx Linux SCO Prosper/FACTS AutoCAD #callahans Satriani
Skot
> On Wed, 18 Jun 2003 17:03:50 +0000, Skot wrote:
>
>
> You are asking the wrong question.
>
> If it's a raid controller, then often the actual hardware is hidden from
> the OS and only virtual hardware is presented to the OS. You use the
> second channel by plugging half of your drives on it (even if there is
> only two drives total) and in the raid card's bios you reconfigure the
> raid array to span both drives. The OS still only sees one drive on
> channel "0"
Now that makes sense. Thanks Brian.
I'm using the second card now and it all makes more sense. Now I
remember why I never used the onboard controller before. Hey, I haven't
had to touch this hardware or OS in 3 years, other than usual
maintenance. ;)
Cheers.
Skot.