Where mkraid has problems

This is a raidtab file. When two halves of the files are exchanged, you can
switch between the bad behaviour of mkraid (mkraid /dev/md0: /dev/md1
is active) and good behaviour of mkraid (ie. makes the raid):

raiddev /dev/md1
        raid-level              1
        nr-raid-disks           2
        nr-spare-disks          0
        chunk-size              4
        persistent-superblock   1
        device                  /dev/sdb3
        raid-disk               0
        device                  /dev/sda3
        failed-disk             1

raiddev /dev/md0
        raid-level              1
        nr-raid-disks           2
        nr-spare-disks          0
        chunk-size              4
        persistent-superblock   1
        device                  /dev/sdc1
        raid-disk               0
        device                  /dev/sdd1
        raid-disk               1

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