Here is an example of how to drop an ASM disk group.
SQL> connect / as sysasm Connected. SQL> drop diskgroup ocr; drop diskgroup ocr * ERROR at line 1: ORA-15039: diskgroup not dropped ORA-15073: diskgroup OCR is mounted by another ASM instance
On racnode2 ASM instance.
SQL> alter diskgroup ocr dismount; Diskgroup altered. SQL>
Back to racnode1 ASM instance, and drop the diskgroup ocr, which is not longer used and required. There are options:
INCLUDING CONTENTS:You must specify this clause if the disk group contains any files.
EXCLUDING CONTENTS: To ensure that Oracle ASM drops the disk group only when the disk group is empty. This is the default. If the disk group is not empty, then an error will be returned.
FORCE: Clears the headers on the disk belonging to a disk group that cannot be mounted by the Oracle ASM instance. The disk group cannot be mounted by any instance of the database.
SQL> drop diskgroup ocr; Diskgroup dropped. SQL>
Find the ASM disk label:
[root@racnode2 ~]# /sbin/blkid ... .. . /dev/sdi1: LABEL="ASM_OCR_VOTE" TYPE="oracleasm" ... .. .
Delete the asm disk “ASM_OCR_VOTE” on one node only:
[root@racnode1 ~]# oracleasm deletedisk ASM_OCR_VOTE Clearing disk header: done Dropping disk: done [root@racnode1 ~]# [root@racnode1 bin]# oracleasm scandisks Reloading disk partitions: done Cleaning any stale ASM disks... Cleaning disk "ASM_OCR_VOTE" Scanning system for ASM disks...
Remove vdi file from VirtualBox.
- go to every VM –>settings –>storage, choose the right vdi file and removes seleted storage attachment.
- go to Virtual Media Manager –>hard disks Tab –> choose the right one, and click ‘Remove’.