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 <diskgroup> dismount;
4) Resize your physical disk/LUN at OS/hardware level.
5) Mount back the diskgroup:
SQL> alter diskgroup <diskgroup> mount;
6) Then resize the ASM disk as the following example:
SQL>ALTERDISKGROUP<diskgroup> RESIZEDISK<disk name><size>MREBALANCEPOWER<1-11>;
SQL>ALTERDISKGROUPDATARESIZEDISKDISK_A1SIZE5000MREBALANCEPOWER11;
From Oracle
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