Subject: Re: Drive Numbering...
To: David Gilbert <>
From: Jason Thorpe <>
List: current-users
Date: 11/15/1995 14:14:53
On Wed, 15 Nov 1995 10:18:30 -0500 
 David Gilbert <> wrote:

 > 	I'd have to agree on this point.  Many other UN*Xen use
 > something like c201d3s0 to be the device for SCSI address 3 sub 0
 > (201 is some form of hardware path) that our HP here uses.

Under HP-UX on the hp300, the info for something like c7d0s0 broke down 
to something like this:

	"Controller at select-code 7, device at target 0, slice 0"

Select-code is a very HP-specific thing, and their SCSI subsystem didn't 
have anything nearly as cool as a "scsibus" abstraction.  "Slice", of 
course, meant "partition", and was quite meaningless on anything but the 
hp800 (the only machine I've ever seen which HP-UX supports partitions 
on, and it's probably for historical reasons .. the 700s and 300s didn't).
Notice that this scheme of addressing doesn't even pay lip-service to LUNs.

 > 	Worse, IMHO, is the fact that you might have to recompile your
 > kernel to change what drives you're swapping to.  'Course we really
 > need an overhaul there, too, to add file swapping and the ability to
 > add/subtract swap.

Yah, this would be nice.  I know someone was working on this at one time, 
but I don't know the status of it right now...

Jason R. Thorpe                                         thorpej@Xenotropic.COM

           Just me and my collection of obsolete computer gear(s).