# Created by Diego Julian Remolina
# Systems Support Specialist III
# Institute for Bioengineering and Bioscience
# Georgia Institute of Technology
# Last edited: 11/16/2005

drbd needs to be updated (re-compiled) everytime a new kernel is installed.
In order to update drbd you need to follow these steps:

1. Make sure there were not protocol or api changes so that you can do changes
   in the secondary, then let it sync and then bring the primary down.

ON THE SECONDARY (aragorn):

2. Update the system so that the new kernels get installed
   up2date -u -f

3. Extract the sources in /usr/src:
   cd /usr/src
   tar -xzf /path/to/drbd-0.7.14.tar.gz

4. Find out what the new kernel is so that you can build drbd for that kernel:
   root@aragorn drbd-0.7.14]# ls /usr/src/kernels/
   2.6.9-22.EL-hugemem-i686  2.6.9-22.EL-i686  2.6.9-22.EL-smp-i686  2.6.9-5.0.5.EL-i686
   Since 2.6.9-22 is the latest kernel, then we want to build the package for the smp
   kernel.
   
5. Now you are ready to build for your new kernel:
   make rpm KDIR=/usr/src/kernels/2.6.9-22.0.1.EL-i686
   make rpm KDIR=/usr/src/kernels/2.6.9-22.0.1.EL-smp-i686

6. Install the rpms located in dist/RPMS/{arch}/

   - Stop current drbd 
   /etc/init.d/drbd stop
   - Remove module in case is still loaded
   rmmod drbd
   - Remove drbd-OLDVERSION rpms, except the drbd km rpm
     so that you keep the module in case you need to fall
     back to the old kernel
   rpm -Fvh --force dist/RPMS/i386/drbd-*

7. Reboot the server.

NOW THE PRIMARY

8. Copy the rpms from the secondary to the primary. DO NOT INSTALL THEM
   YET. /tmp is a good location.

9. Stop heartbeat on the primary and make sure the secondary took over
    Usually nfs4 needs the /etc/init.d/rpcidmapd restart for the clients
    to keep working.

10. Update the primary:  up2date -u -f

11. Remove old rpms and install new ones:
    cd /tmp
    rpm -Fvh --force drbd-*.rpm

13. Reboot the primary and make sure it comes back up and takes over
    correctly.