Update: the day after ...

It wasn't a DRBD problem but a mount problem ... "La notte porta consiglio ..."

.............................................................................................

ok panic ...

I have two servers (linux slackware 13.37 64).
Two drbd partitions. The first is primary on server A and secondary on B, the second partition is primary on B and secondary on A. Both ext4

Server A Server B
/dev/drbd0 (pri) (sec)
(sec) /dev/drbd1 (sec)

I shutdown both server. After restart they all came up BUT the second partition IS EMPTY (mounted, lists only lost+found)

Tried disconnect cable between the two servers, and promote secondary, but partition still empty:

root@fred64:~$ drbd-overview
0:vm_fred WFConnection Primary/Unknown UpToDate/DUnknown C r---- /vm ext4 155G 40G 107G 28%
1:vm_barney WFConnection Primary/Unknown UpToDate/DUnknown C r---- /vmsec ext4 155G 188M 147G 1%

Any suggestion, I'm in trouble !!

... phew he says .... glad it was simple, losing data is a bitch.