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I'm trying to create a RAID partitioning recipe in my preseed file such that the root, boot and swap partitions are RAIDed (using RAID 10 across 4 disks) but the remaining space on each of the disks is not RAIDed, as per the following diagram:

enter image description here

My recipes are as follows:

d-i partman-auto-raid/recipe string                     \
    10 4 0 ext3 /boot                                   \
          /dev/sda1#/dev/sdb1#/dev/sdc1#/dev/sdd1       \
    .                                                   \
    10 4 0 lvm -                                        \
          /dev/sda5#/dev/sdb5#/dev/sdc5#/dev/sdd5       \
    .

 

d-i partman-auto/expert_recipe string           \
boot-root ::                                    \
    100 512 256 raid                            \
        $lvmignore{ }                            \
        $primary{ }                          \
        method{ raid }                          \
    .                                           \
    900 5000 4000 raid                          \
        $lvmignore{ }                            \
        method{ raid }                          \
    .                                           \
    700 5000 4000 ext3                          \
        $defaultignore{ }                        \
        $lvmok{ }                                \
        method{ format }                        \
        format{ }                               \
        use_filesystem{ }                       \
        filesystem{ ext3 }                      \
        mountpoint{ / }                         \
    .                                           \
    64 512 300% linux-swap                      \
        $defaultignore{ }                        \
        $lvmok{ }                                \
        method{ swap }                          \
        format{ }                               \
    .                                           \
    100 1000 1000000000 ext3                    \
        $defaultignore{ }                        \
        $lvmok{ }                                \
        method{ format }                        \
        format{ }                               \
        use_filesystem{ }                       \
        filesystem{ ext3 }                      \
        mountpoint{ /home }                     \
    .

In its current state, /home is being RAIDed across all four drives. What can I do to split it up so that /home is not being shared, to resemble the /foo# partitions in the diagram whilst maintaining the RAID for boot, root and swap?

Any advice, comments or insight into anything I have so far would also be greatly appreciated, documentation for this preseed partitioning stuff is really lacking and I'm trying to decipher what I can from various sources across the net to no avail.

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