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- Path: sparky!uunet!haven.umd.edu!ni.umd.edu!sayshell.umd.edu!louie
- From: louie@sayshell.umd.edu (Louis A. Mamakos)
- Newsgroups: comp.sys.next.sysadmin
- Subject: Re: Help! Installing 3.0 on external HD
- Date: 12 Jan 1993 19:04:31 GMT
- Organization: The University of Maryland, College Park
- Lines: 26
- Message-ID: <1iv4nvINN92g@ni.umd.edu>
- References: <ntomczak.726619722@vega> <1993Jan10.170814.9221@znext.cts.com> <17898@umd5.umd.edu>
- NNTP-Posting-Host: sayshell.umd.edu
-
- In article <17898@umd5.umd.edu> matthews@oberon.umd.edu (Mike Matthews) writes:
- >In article <1993Jan10.170814.9221@znext.cts.com> zeke@znext.cts.com writes:
- >> so the syntax should be
- >> 'b sd(0,2,0)' to boot off of sd2 partition a. The NeXT only has one
- >>controller ( unless you have an extra cpu card a la Spherical ) an that one
- >>defaults to 0. The syntax provided would probably confuse the system, and the
- >
- >Um, no. The first number is the SCSI ID, the second is the LUN (which lots
- >of people theorize will always be 0 on the NeXTs because they only have one
- >SCSI channel; makes sense to me but I can't confirm or deny it personally),
- >and the last is the partition number.
-
- Um, close. :-) The first number is the SCSI controller target number
- (usually referred to as the "SCSI ID"), the second is the logical unit
- number and the third the partitition number of the disk.
-
- The LUN has nothing to do with the NeXT; it is used when the addressed
- SCSI controller on the SCSI bus has more than one unit attached to it.
- In days past, when disks didn't have embedded SCSI controllers, you'd
- have a seperate SCSI controller on the bus which could have one or
- more {ESDI, SMD, ST-506} drives attached to it. The LUN (Logical Unit
- Number) could be used to select amongst the units/disk attached to the
- controller.
-
- Louis Mamakos
-
-