grub

Error 18: Selected cylinder exceeds maximum supported by BIOS
-> the bios is too old and the kernel is byond the 8 Gbyte limit

Install the grub from rescue disc:
mount /dev/sda? /mnt/sysimage
mount --bind /dev /mnt/sysimage/dev
chroot /mnt/sysimage
grub-install /dev/sda


IF the partitions are as follows:
/dev/sda1 windows
/dev/sda2 extended
/dev/sda5 swap
/dev/sda6 /
/dev/sda7 /home

then you need to set /dev/sda2 as the boot partition with fdisk /dev/sda a 2
in the menu.lst of grub needs to be written: root (hd0,5)

siemens 4000 micro needs SM1

The siemens telefon 4000 4010 4015 micro needs Slim-Lumberg-SM1
The SM2 is not compatible!

edit initrd image

1. Rename:
mv initrd.img initrd.img.gz
2, Uncompress:
gzip -d initrd.img.gz
3. Extract: (WARNING!! without "--no-absolute-filenames" extracts in your root "/")
mkdir root
cd root
cpio -i --no-absolute-filenames < ../initrd.img
4. Do the editing
5. New archive:
find . | cpio -o -H newc > ../initrd_new.img
6. Compress:
cd ../
gzip -c initrd_new.img > initrd_new.img.gz
7. Rename:
mv initrd_new.img.gz to initrd.img

howto repair the MBR in linux

1. Pop in the Live CD, boot from it until you reach the desktop.
2. Open a terminal window or switch to a tty.
3. Type "grub"
4. Type "root (hd0,6)", or whatever your harddisk + boot partition numbers are (my /boot is at /dev/sda7, which translates to hd0,6 for grub).
5. Type "setup (hd0)", ot whatever your harddisk nr is.
6. Quit grub by typing "quit".
7. Reboot.

keyboard writes just with capital letters

xmodmap -e 'add Lock = Caps_Lock'
and then press shift and caps_lock

raid tools

To add a device /dev/sdc1 to the raid md0 after failure use

mdadm /dev/md0 --add /dev/sdc1

add device to raid

To create a RAID10 do the following
mdadm --create /dev/md0 --level=10 --raid-devices=4 /dev/sda /dev/sdb /dev/sdc /dev/sdd

to insert a new hard disc by replacing a broken one do
mdadm --manage /dev/md?? --add /dev/newpartition

to monitor your RAID and to send an email if a disc fails:
mdadm --monitor --scan --mail=office@wimmer-christian.de