After some heartbeat switches, i've got now a drbd which is "Primary/Unknown" on one side and "Secondary/Unknown" on the other.
drbd
Heartbeat2+iSASI+DRBD
StandardStep 1: 安装Heartbeat+DRBD Step 2: 安装iSCSI Enterprise Target ...
Heartbeat2+DRBD
Standardharesources2cib.py --stout -c /etc/ha.d/ha.cf /etc/ha.d/haresources