How to fix DRBD recovery from split brain

Step 1: Start drbd manually on both nodes
Step 2: Define one node as secondary and discard data on this

drbdadm secondary all drbdadm disconnect all drbdadm -- --discard-my-data connect all

Step 3: Define anoher node as primary and connect

drbdadm primary all
drbdadm disconnect all
drbdadm connect all