[root@fl8.jp　~]# /etc/init.d/drbd status
drbd driver loaded OK; device status:
version: 8.4.5 (api:1/proto:86-101)
GIT-hash: 1d360bde0e095d495786eaeb2a1ac76888e4db96 build by mockbuild@Build64R5, 2014-08-18 20:00:36
m:res     cs         ro                 ds                 p  mounted         fstype
0:zabbix  Connected  Primary/Secondary  UpToDate/UpToDate  C  /mnt/mysql      ext3
0:zabbix  Connected  Primary/Secondary  UpToDate/UpToDate  C  /var/lib/mysql  ext3

正常:

Secondary/Primary
Primary/Secondary

異常:

Secondary/Secondary
Primary/Unknown
Secondary/Unknown

drbd 切断/接続

# drbdadm down all
# drbdadm up all

# drbdadm down all
# drbdadm invalidate all
# drbdadm up all
# drbdadm connect all

# drbdadm connect all