The following errors occur when creating a new ASM diskgroup:

SQL> CREATE DISKGROUP DATA1 EXTERNAL REDUNDANCY disk 'AFD:DATA1_DISK1' NAME DATA1_DISK1;
CREATE DISKGROUP DATA1 EXTERNAL REDUNDANCY disk 'AFD:DATA1_DISK1' NAME DATA1_DISK1;
*
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15099: disk 'AFD:DATA1_DISK1' is larger than maximum size of 2097152 MBs

SOLUTION

SQL> CREATE DISKGROUP DATA1 EXTERNAL REDUNDANCY disk 'AFD:DATA1_DISK1' NAME DATA1_DISK1 ATTRIBUTE 'compatible.rdbms' = '19.0', 'compatible.asm' = '19.0';

Diskgroup created.