[CentOS] Unable to use DRBD after a reboot

Hi,
I have two servers in a drbd primary/secondary setup.   Everything was fine
until I had to reboot both servers.

The primary rebooted first, the secondary assumed fine, but when the (old
primary) server got back online it was unable to mount the drbd fs
complaining about the modules.

I've tried to find out the problem but the servers seem to have the same
setup

rpm -qa | grep drbd
drbd82-8.2.6-1.el5.centos
kmod-drbd82-8.2.6-2

Kernel 2.6.18-92.1.22.el5 #1 SMP

Am I missing something?

thanks.
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