Set persistent permissions across reboot in linux and UDEV rules for ASM disks

For asm disks owner should be oracle:dba

You need to setup udev rules or edit rc.local 

else after reboot permissions will change back to root

There are 2 methods to do it. Oracle recommends setting up UDEV

Here is alternative to udev

vi /etc/rc.local

#!/bin/bash

# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES

#

# It is highly advisable to create own systemd services or udev rules

# to run scripts during boot instead of using this file.

#

# In contrast to previous versions due to parallel execution during boot

# this script will NOT be run after all other services.

#

# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure

# that this script will be executed during boot.

touch /var/lock/subsys/local

chown oracle:dba /dev/mapper/mpatha

chown oracle:dba /dev/mapper/mpathb

chown oracle:dba /dev/mapper/mpathc

chmod 660 /dev/mapper/mpatha

chmod 660 /dev/mapper/mpathb

chmod 660 /dev/mapper/mpathc

After that check status of service. If its not enabled enable it

systemctl status rc-local.service

systemctl enable rc-local

systemctl start rc-local

2nd method using UDEV

#############preparing disks for ASM

/usr/lib/udev/scsi_id -g -u -d /dev/sdc

3624a93707784b3a3c17b437c00011074

/usr/lib/udev/scsi_id -g -u -d /dev/sdd

3624a93707784b3a3c17b437c0001106f

/usr/lib/udev/scsi_id -g -u -d /dev/sde

3624a93707784b3a3c17b437c00011071

vi /etc/scsi_id.config

options=-g

wq!

vi /etc/udev/rules.d/99-asmdevices.rules

KERNEL=="sd?1", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id -g -u -d /dev/$parent", RESULT=="3624a93707784b3a3c17b437c00011074", SYMLINK+="asm-disk1", OWNER="oracle", GROUP="dba", MODE="0660"

KERNEL=="sd?1", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id -g -u -d /dev/$parent", RESULT=="3624a93707784b3a3c17b437c0001106f", SYMLINK+="asm-disk2", OWNER="oracle", GROUP="dba", MODE="0660"

KERNEL=="sd?1", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id -g -u -d /dev/$parent", RESULT=="3624a93707784b3a3c17b437c00011071", SYMLINK+="asm-disk3", OWNER="oracle", GROUP="dba", MODE="0660"

##############Load rules

/sbin/partprobe /dev/sdc1

/sbin/partprobe /dev/sdd1

/sbin/partprobe /dev/sde1

##################Test rules

udevadm test /block/sdc/sdc1

udevadm test /block/sdd/sdd1

udevadm test /block/sde/sde1

#################Restart UDEV Service

udevadm control --reload-rules

check permissions

cd /dev

ls -lHL /dev/tas*

chown -R oracle:dba asm-disk1

chown -R oracle:dba asm-disk2

chown -R oracle:dba asm-disk3

chmod 660 asm-disk1

chmod 660 asm-disk2

chmod 660 asm-disk3

ls -lHL /dev/asm*