#New HD: setting LUN #
8 messages in this thread
I have a friend who recently bought a Quantum Prodrive LTS 170 for his Amiga
2000 (w/ 68030 and 3.1 ROMS). He has been unable to get it to work. He was
able to change the address via jumpers but cannot find any explanation on how
to change the LUN (which, like the original drive is set to zero). The docs
only say that the two drives must have different LUN's as well as different
addresses, but do not say how to change the LUN.
The drive does not show up as an icon in the Workbench window. Is it just the
LUN setting or do we have to also do something else, like issue a mount
command?
Any help (and explanation of the difference between address and LUN), will be
greatly appreciated.
TIA, Bob.
– Bob Finger, 70404,3110 @ 12-Feb-1995, 11:48:38 EST
It doesn't sound like the LUN is giving you the problem. As long as the main
addresses are different, the controller should find the drives. Although I've
never seen one used, LUNs were created in order to attach another controller to
the SCSI bus, and have that controller control up to another 7 devices, giving
SCSI the ability to actually control up to 49 devices. (Seven main address
controllers X Seven LUNS per controller = 49 devices.) Since you don't have a
secondary controller but an actual hard drive, the LUN setting is usually
ignored. What the problem sounds like is that the drive was not "preped"
properly. In order for the drive to become recognized by AmigaDOS, it must be
partitioned and have the "Rigid Disk Block" written to it. The software that
came with the controller card does this, or the Amiga's own hard disk utilities
can as long as it's told to look for the proper device setting (such as
changing the Amiga's "scsi.device" to GVP's "gvpscsi.device"). Once this
information is written to the drive and the system is rebooted, the hard drive
will become recognizeable and formatable by AmigaDOS.
Regards, Keith.
Keith,
YOu're close. LUN's are so you can have multiple devices (not
controllers) at each address. Since the host adapter (commonly called a
controller) takes up 1 address, and can't have a LUN…you have the possibility
of 8 devices at each of the 7 remaining addresses for a total of 56 possible
devices on one SCSI bus.
LUN's range from 0 to 7, just like SCSI id's range from 0 to 7, for a
total of 8 LUNs per SCSI ID available.
Don
Thanks for the reply. After I sent my message, I realized that my friend
probably hadn't formatted the disk, and I completely spaced on the subject.
Goes to show you what programming in Windoze will do to your brain. We'll give
it another try this evening.
Bob
– Bob Finger, 70404,3110 @ 13-Feb-1995, 08:42:28 EST
Bob,
Your friend apparently mis-read the docs, or the docs are confusing.
Only SCSI devices with the same address need to have different LUN's,
devices at different addresses don't need to have separate LUN's one from
another.
Your friend needs to prep the drive via HDToolBox before the Amiga will
recognize it. (similar to FDISK in the MS-DOS world if you're familiar with
that).
Don
Thanks for your reply, Don. I totally "forgot" about formatting the drive.
Duh. I think the docs, (as read to me over the phone), implied that the LUN
_also_ had to be different, so that threw me for a while.
Thanks again, Bob.
– Bob Finger, 70404,3110 @ 13-Feb-1995, 08:45:31 EST
Leave the LUN alone.
If your friend is using a modern SCSI host adapter just set the SCSI ID to a
unique number then use HDToolBox to set it up.
-sja
Thanks for your reply, Steve. Will give it a try later.
Bob
– Bob Finger, 70404,3110 @ 13-Feb-1995, 08:46:14 EST