This document outlines the process of creating a new ASM disk group using the SQL*Plus command while connected to an ASM instance. It emphasizes the necessity of having unused partitions for the operation and details the steps to check disk headers, mark ASM disks, and create a normal redundancy disk group from those disks. Additionally, it instructs connecting as the oracle user and managing disk group statuses across nodes.

1. CREATE
DISKGROUP
SQLPLUS COMMAND

2. In this article we will be creating new ASM diskgroup using SQLPLUS command
while connected to ASM instance.
You must have an unused partition / disk on the server that can be used to
create ASM diskgroup.
In this activity, we are going to use /dev/sdb4 and /dev/sdb5 to create a new
normal redundancy disk group which needs at least two failure groups.
first check at OS level if you see those two partitions. Use below command to
check

3. Mark the disk headers using the oracleasm utility as root
user. You need to create ASM disks only from one node

4. Scan and list the ASM disks from node 1. If successful,
you must be able to see the ASM disks on other nodes
too
Now that we have marked our ASM disks, we need to
create a normal redundancy diskgroup using these two
disks. Connect to the oracle user and make sure Oracle
Home is set to Grid Home and Oracle SID is set to ASM1
(for node 1)

5. Check the disk & its status

6. Check the disk group & its status
Mount the disk groups from other nodes

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