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## 7. Appendix C. - ide RAID10 with initrd

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

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