How to remove an ASM instance and its corresponding database(s) on UNIX

This operation will DESTROY any databases that are currently running on the +ASM instance

1) Shutdown all databases that are running on the box using the +ASM instance for storage management

2) Use emca -x <sid> to remove the Database Console for each instance

3) Clear the existing raw disks

dd if=/dev/zero of=<raw device>bs=8192 count=1000

OR

drop the raw partition

4) Drop the old parameter file (init<sid>.ora or spfile<sid>.ora)

Default location: <ORACLE_HOME>/dbs

5) Delete / Remove any non ASM supporting directories

BACKGROUND_DUMP_DEST
USER_DUMP_DEST
CORE_DUMP_DEST
etc

6) Remove the ORATAB entry for the ASM instance

7) Remove the resource from cluster ready services (CRS)

if RAC: srvctl remove asm -n nodename
if Standalone: $ORACLE_HOME/bin/localconfing -delete

At this point ... if desired ...a new ASM instance should be able to be recreated (DBCA or manual) ... if necessary ... recreate the raw partitions

From Oracle

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