[CentOS] "multi-boot" drive partitioning

[Frank Cox]

I want to set up a multiple "mode" computer with four separate Centos
installations on it.  The objective here is to have a "spare computer" that I
can boot up into any of four "modes" depending on what I'm swapping it in for a
the moment.  For example, I want to be able to boot it up as a webserver, or as
a fileserver, or as a LTSP-enabled application server.  And so on.

I have a computer here with two 300GB hard drives in it, which I plan to split
into four 150GB partitions, one for each of my "modes".  And I want to install
Centos separately and independently into each partition, so I can just tell
Grub to boot up using whatever partition I choose.

What is the best way to accomplish this?  I have a bad feeling that the drive
partitioning tool is going to complain about having multiple / partitions
unless I take steps to avoid that.

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