drbd sync 깨졌을때 [solved]

/proc/drbd 의 상태가 아래와 같을때 해결방법은?

master

standalone   primary/unknown

slave 

standalone  secondary/unknown

절차:

primary: drbdadm primary all
secondary: drbdadm secondary all
primary: drbdadm connect all

이렇게 했는데 되지 않으면 계속해서
secondary: drbdadm invalidate all
secondary: /etc/init.d/drbd stop
primary: drbdadm connect all
secondary: rmmod drbd
secondary: modprobe drbd
secondary: drbdadm attach r0
secondary: drbdadm invalidate r0
secondary: drbdadm adjust r0


cat /proc/drbd
하면 
sync되는게 보입니다.  이때에도 안보이면

primary: drbdadm primary all
secondary: drbdadm secondary all

이렇게 실행하면 sync되는게 보입니다.