Thank you very much,
what I did now, I just created a new logical volume for /opt :-)
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 320G 0 disk
└─sda1 8:1 0 200,6G 0 part
├─server2-ROOT 254:0 0 27,2G 0 lvm /
├─server2-SWAP 254:1 0 5,7G 0 lvm [SWAP]
├─server2-VAR 254:3 0 93,1G 0 lvm /var
└─server2-OPT 254:5 0 45,9G 0 lvm /opt
Cheers