solved:
root@debian:/home/supervisor# megacli -CfgForeign -Scan -aall
There are 1 foreign configuration(s) on controller 0.
Exit Code: 0x00
root@debian:/home/supervisor# megacli -CfgForeign -Clear -aall
Foreign configuration 0 is cleared on controller 0.
Exit Code: 0x00
root@debian:/home/supervisor# megacli -CfgLdAdd -r1[252:6,252:7] -a0
Adapter 0: Created VD 1
Adapter 0: Configured the Adapter!!
Exit Code: 0x00
root@debian:/home/supervisor#