Whenever a New Kernel is Installed - RDAC Driver Rebuild Required (Redundant Disk Array Controller)
  1. Stop sendmail from automatically starting upon reboot. 
    chkconfig senmdail off
  2. Reboot with new kernel into single user mode (you will see "Buffer I/O errors").
  3. Rebuild the kernel modules: 
    cd /opt/DS3200/IBM_DS3000_Linux_2.6_RDAC/linuxrdac-09.03.0C05.0029
make uninstall
make
make install
  4. Update /boot/grub/menu.lst 
    vi /boot/grub/menu.lst
    Insert lines like the following for the first menu item: 
    title Red Hat Linux (2.6.18-92.1.22.el5) with MPP support
root (hd0,0)
kernel /vmlinuz-2.6.18-92.1.22.el5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet crashkernel=128M@16M
initrd /mpp-2.6.18-92.1.22.el5.img
  5. Reboot using new initrd image
  6. Start sendmail and configure it to automatically start at boot time. 
    chkconfig sendmail on
service sendmail start