How To Resize An ASM Disk? (Doc ID 470209.1)

1) Please backup the database(s) contained inside the associated diskgroup.

2) Then shutdown the databases contained inside the associated diskgroup.

3) Dismount the associated diskgroup to verify no client database connections are accessing this specific diskgroup:

SQL> alter diskgroup dismount;

4) Resize your physical disk/LUN at OS/hardware level.

5) Mount back the diskgroup:

SQL> alter diskgroup mount;

6) Then resize the ASM disk as the following example:

SQL> ALTER DISKGROUP RESIZE DISK M REBALANCE POWER <1-11>;
SQL> ALTER DISKGROUP DATA RESIZE DISK DISK_A1 SIZE 5000 M REBALANCE POWER 11;