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Good read and it explains very clearly what split-brain is, and how to prevent it in simple enough terms.
I've had to explain many times myself what split-brain is and ways to prevent it. I just get starred at. . .
A
When i Restart the drbd service then check the status # cat /proc/drbd it shows ( Connected ro:Secondary/Secondary ) , so after doing the below:
drbdadm disconnect r0 drbdadm connect r0 drbdadm primary r0
and do the same on the other node but # drbdadm secondary r0 still the same i have no /dev/drbd0
