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Date:      Wed, 29 Sep 1999 10:40:58 -0400
From:      gkaplan <gkaplan@castle.net>
To:        Greg Lehey <grog@lemis.com>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: disk partitioning
Message-ID:  <37F224F9.D2891335@castle.net>
References:  <199812270206.DAA19785@qix> <37F0E951.99D97361@castle.net> <37F18382.58B03368@castle.net> <19990929125116.X96948@freebie.lemis.com>

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Greg Lehey wrote:

> [Format recovered--see http://www.lemis.com/email/email-format.html]
>
> On Tuesday, 28 September 1999 at 23:12:02 -0400, gkaplan wrote:
> > Is it possible to install two different versions of freebsd on the
> > same physical disk?
>
> Yes.
>
> > For example suppose I wanted to run current and stable but not at
> > the same time, would the install object?
>
> Do you mean sysinstall?  I don't think I'd use that.
>

Yes, I was hoping to use sysinstall; but it seem to object to using two slices.  What is/are the
alternatives ?

> > Could I get around this by a temporary change to the partition type
> > while doing a second install?
>
> Possibly.  But I think you could just tell it not to use that slice or
> partition.
>
> I run multiple systems on my test machine, all in the same slice:
>
> 8 partitions:
> #        size   offset    fstype   [fsize bsize bps/cpg]
>   a:   163840        0    4.2BSD     1024  8192    16   # (Cyl.    0 - 307*)    / (-CURRENT)
>   b:   163840   163840    4.2BSD     1024  8192    16   # (Cyl.  307*- 615*)    / (3.3-STABLE)
>   c:  4194685        0    unused        0     0         # (Cyl.    0 - 7884*)   (whole disk)
>   d:   163840   327680    4.2BSD     1024  8192    16   # (Cyl.  615*- 923*)    / (3.2-STABLE)
>   e:   614400   491520    4.2BSD     1024  8192    16   # (Cyl.  923*- 2078*)   /usr (-CURRENT)
>   f:   614400  1105920    4.2BSD     1024  8192    16   # (Cyl. 2078*- 3233*)   /usr (3.3-STABLE)
>   g:   614400  1720320    4.2BSD     1024  8192    16   # (Cyl. 3233*- 4388*)   /usr (3.2-STABLE)
>   h:  1859965  2334720    4.2BSD     1024  8192    16   # (Cyl. 4388*- 7884*)   /home
>
> Note that there's no swap there; that's on a different disk.  Also,
> you can use the same swap partition for each system, and in this
> configuration I use the same /home partition for each system.
>

My present system is wd0 = 4.3G wd1=13.5G with w95b and PM-BootManager on wd0. My plan was to install
on wd1:a working copy of freebsd, a test copy of freebsd, and a working copy of linux. I had no plan
to use a disk manager and so wanted to keep roots below the 1024 cylinder boundary.  PM-BootManager
seem to work well ( after setting the disk geometry )  I suppose that lilo or booteasy would work
equally well; but I don't want to change my wd0 MBR till I have more confidence in my knowledge of
the systems involved. I thought to partition wd1 as:
<slice - starting at cyl 0> <extended partition - spanning cyl 1024 > < slice -  the remaining
physical  disk>

My question is: is this reasonable, or am I shooting myself in the foot?

> Greg
> --
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