Mount/dismount ASM diskgroups

-- For mount a diskgroup,(This is instance specific, for mounting on all nodes, run the same on all nodes)

SQL>alter diskgroup DATA mount;

or

asmcmd>mount DATA

-- For umount a diskgroup,(This is instance specific, for unmounting on all nodes, run the same on all nodes)

SQL>alter diskgroup DATA dismount;

or

asmcmd>umount DATA

-- To mount/Dismount all the diskgroups

SQL>alter diskgroup ALL mount;

SQL>alter diskgroup ALL dismount;