cant grow vmfs

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Hi guys, I´ve got a ESXi 6.5 on which i want to expand a vmfs-volume via gui it does not work (yes i rescanned the hba, as one can see in the imgur-album), and via cli im not 100% sure if i can fire off the command and not damage it..

here i´ve collected some screenshots http://imgur.com/a/Hp9s3

could someone please tell me which commands i should enter to extend the store?

lets say i fire off the command with the possible layout wrong (i.e 2000 insted of 20) what would happen? would it do anything at all?