Scripted RAID config

[Peter Eisch]

In the Customization Guide there's an example for how to sniff out drives on
a system, but that's really only pertinent to IDE-interface devices.  Is
there a similarly clever way to scan scsi controllers?

I'd like to do the same as this:

for file in /proc/ide/h*
do
  mymedia=`cat $file/media`
  if [ $mymedia == "disk" ] ; then
      hds="$hds `basename $file`"
  fi
done

...

I suppose that I could just change the $numhd test to be -lt 2.  Here is
what I've found to be quite handy:

#!/bin/sh

hds=""
mymedia=""

for file in /proc/ide/h*
do
  mymedia=`cat $file/media`
  if [ $mymedia == "disk" ] ; then
      hds="$hds `basename $file`"
  fi
done

set $hds
numhd=`echo $#`


if [ $numhd == "1" ] ; then
  #1 drive
  echo "#partitioning scheme generated in %pre for 1 drive" > \
     /tmp/part-include
  echo "zerombr yes" >> /tmp/part-include
  echo "clearpart --all --initlabel" >> /tmp/part-include
  echo "part /boot --fstype ext3 --size 50" >> /tmp/part-include
  echo "part swap --recommended" >> /tmp/part-include
  echo "part / --fstype ext3 --size 1 --grow" >> /tmp/part-include
else
  #2 drives
  echo "#partitioning scheme generated in %pre for 2 drives" > \
     /tmp/part-include
  echo "zerombr yes" >> /tmp/part-include
  echo "clearpart --all --initlabel" >> /tmp/part-include
  drive=0
  bootdevs=''
  rootdevs=''
  for pdev in $hds
  do
    bootp=raid."$drive"1
    rootp=raid."$drive"2
    bootdevs="$bootdevs $bootp"
    rootdevs="$rootdevs $rootp"
    echo "part $bootp --size 50 --ondisk $pdev" >> /tmp/part-include
    echo "part $rootp --size 1 --grow --ondisk $pdev" >> /tmp/part-include
    echo "part swap --recommended --ondisk $pdev" >> /tmp/part-include
    let drive=$drive+1
  done
  echo "raid /boot --level=1 --device=md0 --fstype ext3 $bootdevs" >> \
     /tmp/part-include
  echo "raid / --level=1 --device=md1 --fstype ext3 $rootdevs" >> \
     /tmp/part-include
fi