Description of problem:

I have a machine with disks /dev/sda and /dev/sdb. 

The partitioning shall be simple:

   /dev/sda = [ sda1 ][   sda2   ] 
   /dev/sdb = [ sdb1 ][   sdb2   ]

with /dev/sda1 as /boot
     /dev/sdb1 as /xboot (basically, a throwaway)
     and a software RAID1 on /dev/sda2 + /dev/sdb2

[I'm working from notes here so this is just "as near as I noted it down". Will try again after Fedora 13 is running using a new pair of disks]

Step 1: Partition /dev/sda in anaconda

   /dev/sda1 => 200 MiB, force primary partition
   /dev/sda2 => remainder of disk, make it a "RAID partition"

Step 2: Clone /dev/sda's structure to /dev/sdb

   "Create Software RAID" - 
      "RAID Clone" - Source "/dev/sda", Target: "/dev/sdb"
   
   Problem!

   Anaconda says: "The source drive you selected has 
   partitions which are not constrained to the drive /dev/sda"

This is wrong, all the partitions on /dev/sda have been explicitly constrained to be on /dev/sda. It is also irrelevant as I want to clone /dev/sda to /dev/sdb.

Workaround: Give up on the drive cloning approach.

   Create /boot, ext4, force primary, 200 MiB on /dev/sda --> yields /dev/sda1
   Rest of /dev/sda: mark as software RAID, froce primary --> yields /dev/sda2

   Do exactly the same on /dev/sbd (using /xboot as mountpoint)

   Then combine /dev/sda1 and /dev/sdb1 into /dev/md0 RAID1

How reproducible:

   On this hardware, tried twice.