Prior to Oracle Database 11g Release 2, you had to issue the following commands in sqlplus to mount and dismount a diskgroup:
SQL> alter diskgroup fra mount;
Diskgroup altered.
SQL> alter diskgroup fra dismount;
Diskgroup altered.
As of Oracle Database 11g Release 2, an easier and more SA friendly approach is provided with asmcmd:
ASMCMD> mount fra
Looking at the disk group [...]
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