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drbd + ocfs2

I have this problem
When I run
mkfs -t ocfs2 -N 2 -L ocfs2_drbd0 /dev/drbd0

the result is

mkfs.ocfs2: could not create domain while initializing the dlm.
As this is an existing OCFS2 volume, it could be mounted on an another node
in the cluster.
however, as mkfs.ocfs2 is unable to initialize the dlm, it cannot detect if
the volume is in use or not.

How can I solve?