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Date: Tue, 14 Oct 1997 23:47:55 +0200 (MET DST)
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From: Eivind Eklund <perhaps@yes.no>
To: Simon Shapiro <Shimon@i-Connect.Net>
CC: greg@lightningweb.com, freebsd-scsi@FreeBSD.ORG, freebsd-fs@FreeBSD.ORG
In-reply-to: Simon Shapiro's message of Wed, 23 Jul 1997 23:21:48 -0700 (PDT)
Subject: RE: adding RAID to the OS without re-partitioning
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	<XFMail.970723232148.Shimon@i-Connect.Net>
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> 
> 
> Hi "Greg K. Cagle";  On 23-Jul-97 you wrote: 
> > I plan on adding a RAID disk array to my existing server.  Ther server
> > has 
> > three HDD's in it now, with "/" as one, "/usr/" as another, and a spare 
> > that's partitioned as "/scratch/".
> > 
> > The disk array will be an independent unit, and will hook up to the 
> > external port on my Adaptec 2940UW.  The company (Baydel) says that the 
> > array will appear as one large volume to FreeBSD.
> > 
> > My question:  How do I include the new array as part of the filesystem, 
> > without re-installing?  I know I can make those choices when I first 
> > install the OS, but can I add a partition now, without messing up 
> > anything?  I want to end up with the large RAID as my "/usr/" partition.
> > 
> > Thanks for suggestions,
> > 
> > Greg
> > 
> > ps I have 2.1.5 on a Pentium Pro 200 with 128MB ram.
> 
> Since no on else took it on, I will donate my $0.02.
> 
> This is really not a SCSI issue at all.
> 
> essentially, this is what you do:

[Long and complicated description deleted]

This use an MS-DOS partition table, and is not how I would have done
it - I would have done

## Find SCSI device number
$ dmesg | grep sd
sd17(dpt0:1:0): Direct-Access 16394MB (32542592 528 byte sectors)

## Initial labelling of disk
$ disklabel -rw sd17 auto

(you'll likely get a warning about "wrong magic number" in the syslog
about here - ignore it)

## Set up partitions
$ disklabel -e sd17
(Remember to check that it all sum up correctly, and that the sum of
each offset+size is equal to the offset of the next slice - and slice
c should cover the entire disk)

## Install filesystems
$ newfs /dev/rsd17a
for each of a,e,f,g (or whatever filesystems you use)

And now just mount them.  (Shimon was more detailed - I just say that
this is described both in the handbook and the FAQ ;-)

Eivind.