If you are interested in a very simple root raid1 support for kernel 2.2.x and
raidtools 0.42 without the need of initrd, take a look at
ftp://ftp.ddb.de/pub/linux/root_raid1_support/
You will find there a small patch for drivers/block/md.c to have raid1 setup
for the root partition at boot time and a raid1 stop for the root partition
at the end of a system shutdown.
I didn't test it, but the patch could also work for raid5 devices. If you like
to check this out, remove the comment brackets "not supported yet" in line 1307
of the patched md.c and change the md= parameters.
Thomas
