sd, sd, who's got the sd

[Styma, Robert E (Robert)]

Tried out FC7T4 on my test machine as a clean install.
The install went in clean and everything looks good.  The
machine is triple boot with FC7T3 and CentOS 5Beta.
It had one PATA (IDE) drive in the primary master.  For
the FC7T4 testing, I added a SATA PCI card and a SATA drive.

Now, FC7T3 went in first when there was only the IDE drive.
It saw the IDE drive as SDA.
SDA1 -> /
SDA2 -> /home
SDA3 -> swap

Added CentOS 5 Beta to the mix to see if the final version would
be suitable for my wife.  It detected the primary IDE as HDA as
expected.
HDA1 -> / (from FC7T3)
HDA2 -> /home
HDA3 -> swap
HDA4 -> Extended
HDA5 -> / (from CentOS 5 Beta)

So far everything makes sense.

Added the SATA drive and installed FC7T4 as an initial install
on the SATA Drive.  During installation, it detected the
SATA drive as SDA and the IDE drive as SDB!

I let it install grub and told it to allow me to boot to
SDB1 (FC7T3) and SDB5 (centos).  It did not detect these
automagically, but did allow me to add them during install.

The triple boot works.  Fortunately 
the FC7T3 system sees the IDE drive as SDA and the SATA as SDB.
That way things mount correctly.

The question becomes, can I predict what will happen when I
install an IDE primary slave.
CentOS 5Beta with the old drivers will detect it as HDB.

How will the two FC7 systems detect the new drive?

Is there a method to the madness?


Bob S