Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!icdoc!qmw-cs!liam
From: liam@cs.qmw.ac.uk (William Roberts)
Newsgroups: comp.unix.aux
Subject: Re: Another Question
Message-ID: <2600@sequent.cs.qmw.ac.uk>
Date: 31 Jul 90 10:27:59 GMT
References: <2939@dftsrv.gsfc.nasa.gov>
Organization: Computer Science Dept, QMW, University of London, UK.
Lines: 27

Yes, you have to have a MacPartition because the Mac ROMs expect to boot
from a genuine HFS filesystem (Yes, we hate this as well).

A/UX Startup needs to work from your MacPartition System Folder, but
you can otherwise change it however you want to. Once you have booted
A/UX the system folder in the Mac Partition is ignored.

Layout 1.9 - no idea. Try it. You will need to install it in the
System Folder that you can see in /:mac:sys:System Folder, unless you
have gotten clever and started using personal system folders.
If you can't install it in a booted System, copy the System File onto
the Mac Partition, boot again from a floppy and install it onto that copy.
Then boot A/UX again and copy it back. (Tedious!).


Disks - the information in /etc/disktab is just about fine-tuning the
layout of the 4.2 filesystems to try to minimise head movements. If
you don't have a suitable disktab entry, then any entry will work but you
might get slightly worse performance. The 4.2 assumptions are that a
disk has a fixed number of sectors per track, which isn't true on the 
newer bigger SCSI disks anyway, so you can't win all the time.
-- 

William Roberts                 ARPA: liam@cs.qmw.ac.uk
Queen Mary & Westfield College  UUCP: liam@qmw-cs.UUCP
Mile End Road                   AppleLink: UK0087
LONDON, E1 4NS, UK              Tel:  071-975 5250 (Fax: 081-980 6533)