InfoScale™ 9.0 Storage Foundation for Oracle® RAC Configuration and Upgrade Guide - AIX

To create database storage on ASM

1. Log in as the root user to the CVM master:

   To determine the CVM master:

   # vxdctl -c mode

2. Initialize the disks as VxVM disks:

   # vxdisksetup -i rhdisk75 format=cdsdisk

3. Create the CVM disk group and volume:

   # vxdg -s init ora_asm_dg rhdisk75

   # vxassist -g ora_asm_dg make ora_asm_vol 2000M

4. Set the permissions for the Oracle user on the volume:

   # vxedit -g ora_asm_dg  \
   set group=dba user=oracle mode=660 ora_asm_vol

5. Set the devsubtype variable to dsvmprime for raw volumes.

   Note:

   Oracle ASM on AIX requires the volume manager (VxVM) setting dsvmprime when raw volumes are used. The volume setting allows VxVM to access the first 4KB of the disk, normally reserved for AIX LVM use. This attribute must be set before any ASM usage of the volume. Changing the setting later can cause corruption during rebalance or other ASM operations. The possible corruption which may occur is not due to any known issue in VxVM.

   Check the current setting for the devsubtype variable for each volume:

   # vxprint -g <dg> -m volume_name | grep devsubtype

   To change the required setting to the correct volume sub-type:

   # vxvol -g dg_name set devsubtype=dsvmprime volume_name

   For more information, see the following technote:

   https://www.veritas.com/support/en_US/article.HOWTO58969