How to configure Raw Disks in RHEL 5 for Oracle11g udev

The following is to change the owner, group and permissions for raw devices used for Oracle RAC.

Create a file called /etc/udev/rules.d/65-raw-permissions.rules with these contents:

#Set permissions of raw bindings to Oracle Clusterware devices

KERNEL=="raw1", OWNER="root", GROUP="oinstall", MODE="640"

KERNEL=="raw2", OWNER="root", GROUP="oinstall", MODE="640"

KERNEL=="raw3", OWNER="oracle", GROUP="oinstall", MODE="640"

KERNEL=="raw4", OWNER="oracle", GROUP="oinstall", MODE="640"

KERNEL=="raw5", OWNER="oracle", GROUP="oinstall", MODE="640"

Test executing:

udevtest /class/raw/raw1

It should show something like:

udevtest /class/raw/raw1

main: looking at device '/class/raw/raw1' from subsystem 'raw'

udev_rules_get_name: rule applied, 'raw1' becomes 'raw/raw1'

udev_device_event: device '/class/raw/raw1' already in database, validate currently present symlinks

udev_node_add: creating device node '/dev/raw/raw1', major = '162', minor = '1', mode = '0640', uid = '0', gid = '600'

main: run: 'socket:/org/kernel/udev/monitor'

main: run: '/lib/udev/udev_run_devd'

main: run: 'socket:/org/freedesktop/hal/udev_event'

main: run: '/sbin/pam_console_apply /dev/raw/raw1 '

To apply the rules run:

# start_udev

Starting udev:                           [  OK  ]

References:

http://www.oracleflash.com/7/How-to-configure-Raw-Disks-in-RHEL-5.html

http://www.ardentperf.com/2008/02/13/oracle-clusterware-on-rhel5oel5-with-udev-and-multipath/