SCSI basics

[xaccrocheur]

Hiya

On two of my drives I cannot select a LUN > than 4 !
I mean, if all SCSI peripherals are like this, this allows for only 4 units on the chain ?

What am I missing ?
 
The drive supplied with the Miggy is, interestingly enough, LUN1. Assuming that the GVP board has the LUN0, my CD-Rom works reliably when assigned LUN2.

At this point it boots and works like a breeze.

But when I plug the seagate, give it the LUN4 and remove the termination jumper on the Teac CD-Rom,

The machine boots, but presents a CD0:Uninitialized gray icon, and HDT now only sees 2 units, the Conner HD0&1 Drive, and a second with LUN4, I assume it's the Seagate but as usual, I can do nothing with it.

What gives ?
Is it really possible that this drive, the Seagate HAWK, something that costed a kidney when 1st available, A BIG server drive, only allows for the setup of the following LUNs : 1, 2, and 4 ?

I kid you not, here are the full specs of the drive

Besides, it uses a module, absolutely non-standard, that looks like a mini-PCI card slot, for termination purposes, amongst others, witch leaves me out in the cold since I don't have this module. However I used this drive a lot on various linuxboxes, and it has never complained about this so far.

And the IBM waiting to be integrated (what, I want to fully populate my SCSI chain !) only allows 0, 1, 2 and 3. Bah!

at least, this latter has a proper termination pinout.

My questions :
# HDToolBox, when he cares to start, offers the possibility of specify the LUN. In the software. Does that effectively change the LUN, or is it something else ?

# Can you affect the LUN in another way that the jumpers on the unit ?

# Since my system is working with HD0&1 as LUN1 and CD-Rom as LUN2 *[color=FF9900]no matter the termination jumper[/color][/b][/i]*,set or not on the CD-Rom, can I assume that my GVP HC+8 is "intelligent" enough to auto-terminate the chain ?

If you have read so far and care a little, you may have think that : Why does'nt this twit use the IBM drive to terminate his chain properly and give us a break.

I hear you, but no, the IBM drive, a very modern ultra-slim 4560MB SCSI  drive, does not permit the use of LUNs above... 3!

Am I stuck ? The window is open, should I jump ? :madashell:  :crazy:  :getmad:  :pissed:  :nervous:  :huh:  :shocked:  :cry:

Thanks anyway  8-)

pX

[xaccrocheur]

vortexau wrote:
(snip)
[/b] scan of my Blizzard 2060 controlled devices:

(snip)
 

WOW this is neat ! I can't believe that my machine is WORKING, when "mounter" is showing me nothing but a BLANK window, after scanning the bus !

Damn  :-x

pX

[xaccrocheur]

pVC wrote:
Seems that you've understood wrong how those id-jumpers work.

yes I have, indeed.  :-) thanks for your explaination, I must have been drunk not to figure it out  :-D

putting jumper on first and third place gives you 1+4=5

Haha ! That was the trick ! How STUPID of me, that was close to OBVIOUS ! (sigh) :-D

Well I did what you advised, I now have a proper chain with :

GVP HC+8 Ser.II Rev.II (has a PSU socket, drains it from the ZII port)

TEAC SCSI CD-ROM x16
Conner CP30540 520 Mg SCSI HD (came w/ the machine I guess, am I correct ?)
IBM DDRS-HG 4560Mg SCSI HD
Seagate Hawk ST15230N (the BIG one, server stuff, double the thickness and heavy metal case)

But HDT still *refuses* to deal w/ my IBM and seagate drives !

And mounter's list is still VOID.  :-?

I managed to low-level-format the HAWK drive with the WB 3.1 HDT but that was all he allowed me to do, and errored when saving to drive table (ouch  :nervous: ) and now this : Nothing.

Oh, I must stress that at each boot, even despite this latter is currently very long, I always hot-reset the machine, not knowing if the drives are at full spinning speed when the WB needs them to.

After I have all setup (inch Allah), I know I can set the start and spinning times on the IBM and the HAWK using jumpers (yes !!) I I hope to eventually end up with one of the MAIN features I love the Amiga for : A FAAAST boot.

I'm starting to suspect my SCSI ribbon cable. It's a BIG one, full lengh allowing 7 units, like 1 meter long, been used for ages, all yellowed, maybe it's tired now.

I have this new one allowing only 3 units, will thoroughly test ALL the units with various settings. I *know* that SCSI heaven is at stake.

Thank you very much for your help. And for reading my bad english. i know it's painful, and really thank you all for your indulgence.

peace

pX