This allows preseeding of a fully configured RAIDed system by setting
partman-auto/method to "raid" and using partman-auto-raid/recipe to tell
it how to construct the RAID array(s).

The preseedable parameter partman-auto-raid/recipe should consist of
recipes separated by periods ("."). The recipes are of the form:

<raidtype> <devcount> <sparecount> <fstype> <mountpoint> <devices> <sparedevices> <extra-args>

where <devices> is a list of the devices to make up the RAID and
<sparedevices> is a list of the spare devices in the array; devices are
separated by hashes ("#").

<extra-args> can be used to pass extra arguments to "mdadm --create", like
"--layout o2". Blanks must be substituted by hashes ("#"), e.g. you have
to specify "--layout#o2".

For example:
d-i partman-auto-raid recipe string  \
  1 2 0 ext3 / /dev/sda1#/dev/sdb1 . \
  1 2 0 swap - /dev/sda5#/dev/sdb5 .
This must be written all on one line; if you write it across multiple lines
you must use continuation characters (as in the example).

This makes the first RAID device that was created by this udeb be a RAID1 of
two disks disc0/part1 and disc1/part1 and be formatted as ext3 and mounted
on /.  The second is also a RAID1 and used as swap (and the mountpoint
ignored).

-- Simon Huggins <huggie@earth.li>
sponsored by Black Cat Networks http://www.blackcatnetworks.co.uk/

It is also possible to preseed LVM over RAID.  The following example will
create a RAID 1 setup on two hard drives with:

  /dev/md0 as /boot (ext3)
  /dev/md1 as a LVM physical volume
  /dev/mapper/<hostname>-root as / (ext3)
  /dev/mapper/<hostname>-swap_1 as swap
  /dev/mapper/<hostname>-home as /home (ext3)

--- 8< ---
d-i partman-auto/method string raid

d-i partman-auto/disk string /dev/sda /dev/sdb

d-i partman-auto-raid/recipe string			\
	1 2 0 ext3 /boot				\
		/dev/sda1#/dev/sdb1			\
	.						\
	1 2 0 lvm -					\
		/dev/sda5#/dev/sdb5			\
	.

# In the expert_recipe, there is a stanza for each RAID partition
# and each LVM partition.
# The RAID partitions are tagged as "lvmignore", while
# the LVM logical volumes as "defaultignore" and "lvmok".
# The RAID partition containing the LVM volumes must be made big
# enough to hold them all.
# Note that in the example shown here the mountpoint for /boot
# (which is not encapsulated within LVM) is specified in the
# partman-auto-raid recipe, rather than in the corresponding 
# raid partition definition below.
#
d-i partman-auto/expert_recipe string			\
	multiraid ::					\
		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 }		\
		.
--- >8 ---