8. Appendix D. - ide RAID1-10 with initrd

This is a system made up of an assortment of odds and ends. The root mounted raid device is comprised of a RAID1 made up of one RAID0 array from odd sized disks and a larger regular disk partition. Examination of the lilo.conf files may give you better insight into the reasoning behind the various parameters.

/dev/md0 is the /boot partition and is autostarted by the kernel
/dev/md1 is one half of the mirror set for md2, autostarted by kernel
/dev/hda3 is the other half of the mirror set for md2
/dev/md2 is the RAID1 /dev/md1 + /dev/hda3, started by initrd

df
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/md2                138381     74421     56815  57% /
/dev/md0                  2011      1360       549  71% /boot

# ----------------------------

 fdisk -ul /dev/hda

Disk /dev/hda: 8 heads, 46 sectors, 903 cylinders
Units = sectors of 1 * 512 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/hda1            46      4415      2185   fd  Linux raid autodetect
/dev/hda2          4416     43423     19504   82  Linux swap
/dev/hda3         43424    332303    144440   83  Linux native

# ----------------------------

 fdisk -ul /dev/hdc

Disk /dev/hdc: 8 heads, 39 sectors, 762 cylinders
Units = sectors of 1 * 512 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/hdc1            39      4367      2164+  fd  Linux raid autodetect
/dev/hdc2          4368     70199     32916   82  Linux swap
/dev/hdc3         70200    237743     83772   fd  Linux raid autodetect

# ----------------------------

 fdisk -ul /dev/hdd

Disk /dev/hdd: 4 heads, 39 sectors, 762 cylinders
Units = sectors of 1 * 512 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/hdd1            39    118871     59416+  fd  Linux raid autodetect

# ----------------------------

# raidtab
#
raiddev /dev/md0
        raid-level      1
        nr-raid-disks   2
        persistent-superblock   1
        chunk-size      8
        device          /dev/hdc1
        raid-disk       1
        device          /dev/hda1
        raid-disk       0

raiddev /dev/md1
        raid-level      0
        nr-raid-disks   2
        persistent-superblock   1
        chunk-size      8
        device          /dev/hdc3
        raid-disk       0
        device          /dev/hdd1
        raid-disk       1

raiddev /dev/md2
        raid-level      1
        nr-raid-disks   2
        persistent-superblock   1
        chunk-size      8
        device          /dev/md1
        raid-disk       1
        device          /dev/hda3
        raid-disk       0

# ----------------------------

 cat linuxrc
#!/bin/sh
# ver 1.02 2-22-00
#
############# really BEGIN 'linuxrc' ###############
#
# mount the proc file system
/bin/mount /proc

# autostart /boot partition and raid0
/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.gz

./bin
./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/console
./dev/hda
./dev/hda1
./dev/hda2
./dev/hda3
./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

# ----------------------------

 cat lilo.conf.hda
# GLOBAL SECTION
# device containing /boot directory
disk=/dev/md2
# geometry
  bios=0x80
  cylinders=903
  heads=8
  sectors=46
# geometry for 2nd disk
# bios will be the same because it will have to be moved to hda
#  cylinders=762
#  heads=8
#  sectors=39

# dummy
  partition=/dev/md0
# start of device "disk" above
  start=46
# second device
#  start=39

# seem to have some trouble with 2.2.14 recognizing the right IRQ
  append = "ide1=0x170,0x376,12 ether=10,0x300,eth0 ether=5,0x320,eth1"

boot=/dev/hda
map=/boot/map
install=/boot/boot.b

initrd=/boot/initrd.gz

image=/boot/zImage
root=/dev/md2
label=LinuxRaid
read-only

# ----------------------------

 cat lilo.conf.hdc
# GLOBAL SECTION
# device containing /boot directory
disk=/dev/md2
# geometry
  bios=0x80
#  cylinders=903
#  heads=8
#  sectors=46
# geometry for 2nd disk
# bios will be the same because it will have to be moved to hda
  cylinders=762
  heads=8
  sectors=39

# dummy
  partition=/dev/md0
# start of device "disk" above
#  start=46
# second device
  start=39

# seem to have some trouble with 2.2.14 recognizing the right IRQ
  append = "ide1=0x170,0x376,12 ether=10,0x300,eth0 ether=5,0x320,eth1"

boot=/dev/hdc
map=/boot/map
install=/boot/boot.b

initrd=/boot/initrd.gz

image=/boot/zImage
root=/dev/md2
label=LinuxRaid
read-only