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1.2. Testing
To test that the data is actually syncing between the hosts copy some files on the drbd01, the primary, to /srv:
sudo cp -r /etc/default /srv
Next, unmount /srv:
sudo umount /srv
Demote the primary server to the secondary role:
sudo drbdadm secondary r0
Now on the secondary server promote it to the primary role:
sudo drbdadm primary r0
Lastly, mount the partition:
sudo mount /dev/drbd0 /srv
Using ls you should see /srv/default copied from the former primary host drbd01.