ORA-15018, ORA-15099 When Creating Diskgroup in ASM
When i am trying to create your first diskgroup on the ASM instance in rac setup. However, it fails when the disk size is above 2 Terabyte in size. And found out that Since you have already installed patch 6453944, you are receiving the error ORA-15099.
It's ok to use disks with exactly 2TB size.