The command : rpm -qa | grep drbd
.. Will show installed drbd packages.
((
http://www.linbit.com/support/drbd-8.4.0/rhel6/ ))
uname -r : The kernel version. uname -a : The architecture is shown too.
Only modules for the running kernel can be used.
Solutions: 1: Boot into a kernel matching kmod-drbd-8.4.0_`uname-r`-?.el6.
Or 2: build a new package for your kernel. (Latest is 2.6.32-131.0.15.)
http://www.drbd.org/users-guide/s-build-rpm.html
Quote: "Note that any kernel upgrade will require you to generate a new
drbd-km package to match the new kernel."
.