This guide describes DRBD version 8.4 and above. For 8.3 please look here.
GFS uses CLVM, the cluster-aware version of LVM, to manage block devices to be used by GFS. In order to use CLVM with DRBD, ensure that your LVM configuration
/etc/lvm/lvm.conf:
locking_type = 3
This guide describes DRBD version 8.4 and above. For 8.3 please look here.