RAID1 over striped RAID0 pair.... the disks in the RAID0 sets are not quite the same size, but close enough.
/dev/md0 is the /boot partition and is autostarted by the kernel
/dev/md1 and /dev/md3 are the two RAID0 sets autostarted by the kernel
/dev/md2 is the root partition and is started by initrd
df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/md2 118531 76485 35925 68% /
/dev/md0 1917 1361 457 75% /boot
# ----------------------------
fdisk -ul /dev/hda
Disk /dev/hda: 4 heads, 46 sectors, 903 cylinders
Units = sectors of 1 * 512 bytes
Device Boot Start End Blocks Id System
/dev/hda1 46 4231 2093 fd Linux raid autodetect
/dev/hda2 4232 166151 80960 fd Linux raid autodetect
# ----------------------------
fdisk -ul /dev/hdb
Disk /dev/hdb: 5 heads, 17 sectors, 981 cylinders
Units = sectors of 1 * 512 bytes
Device Boot Start End Blocks Id System
/dev/hdb1 17 83384 41684 fd Linux raid autodetect
# ----------------------------
fdisk -ul /dev/hdc
Disk /dev/hdc: 7 heads, 17 sectors, 1024 cylinders
Units = sectors of 1 * 512 bytes
Device Boot Start End Blocks Id System
/dev/hdc1 17 84013 41998+ fd Linux raid autodetect
/dev/hdc2 84014 121855 18921 82 Linux swap
# ----------------------------
fdisk -ul /dev/hdd
Disk /dev/hdd: 4 heads, 46 sectors, 903 cylinders
Units = sectors of 1 * 512 bytes
Device Boot Start End Blocks Id System
/dev/hdd1 46 4231 2093 fd Linux raid autodetect
/dev/hdd2 4232 166151 80960 fd Linux raid autodetect
# ----------------------------
# raidtab
#
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
persistent-superblock 1
chunk-size 8
device /dev/hda1
raid-disk 0
device /dev/hdd1
raid-disk 1
raiddev /dev/md1
raid-level 0
nr-raid-disks 2
persistent-superblock 1
chunk-size 8
device /dev/hdd2
raid-disk 0
device /dev/hdb1
raid-disk 1
raiddev /dev/md2
raid-level 1
nr-raid-disks 2
persistent-superblock 1
chunk-size 8
device /dev/md1
raid-disk 0
device /dev/md3
raid-disk 1
raiddev /dev/md3
raid-level 0
nr-raid-disks 2
persistent-superblock 1
chunk-size 8
device /dev/hda2
raid-disk 0
device /dev/hdc1
raid-disk 1
# ----------------------------
contents of linuxrc
cat linuxrc
#!/bin/sh
# ver 1.02 2-22-00
#
############# really BEGIN 'linuxrc' ###############
#
# mount the proc file system
/bin/mount /proc
# start raid 1 made of raid 0's
/bin/raidstart /dev/md2
# tell the console what's happening
/bin/cat /proc/mdstat
# Everything is fine, let the kernel mount /dev/md2
# tell the kernel to switch to /dev/md2 as the /root device
# The 0x900 value is the device number calculated by:
# 256*major_device_number + minor_device number
echo "/dev/md2 mounted on root"
echo 0x902>/proc/sys/kernel/real-root-dev
# umount /proc to deallocate initrd device ram space
/bin/umount /proc
exit
# ----------------------------
contents of initrd
./bin/ash
./bin/echo
./bin/raidstart
./bin/mount
./bin/umount
./bin/cat
./bin/sh
./dev/tty1
./dev/md0
./dev/md1
./dev/md2
./dev/md3
./dev/md4
./dev/console
./dev/hda
./dev/hda1
./dev/hda2
./dev/hda3
./dev/hdb
./dev/hdb1
./dev/hdb2
./dev/hdb3
./dev/hdc
./dev/hdc1
./dev/hdc2
./dev/hdc3
./dev/hdd
./dev/hdd1
./dev/hdd2
./dev/hdd3
./dev/initrd
./dev/ram0
./dev/ram1
./dev/ram2
./dev/ram3
./dev/ram4
./dev/ram5
./dev/ram6
./dev/ram7
./etc/raidtab
./etc/fstab
./lib/ld-2.1.2.so
./lib/ld-linux.so.1
./lib/ld-linux.so.1.9.9
./lib/ld-linux.so.2
./lib/ld.so
./lib/libc-2.1.2.so
./lib/libc.so.6
./linuxrc
./proc