There could be a requirement from client to have custom device names such as /dev/asmdisk01 for an actual device with name /dev/sdb. Follow the steps outlined in this post to set custom device names using udev.
In order to create customer name (/dev/asmdisk01p1) for /dev/sdb set udev rules as below:
1. Find UUID of device
First, find the the UUID of the device with the scsi_id command as shown below.
# /usr/lib/udev/scsi_id -g -u /dev/sdb 1IET_00020002
Save this UUID, as this ID will be used later.
2. Create new udev rule
Create new udev rule file in appropriate location as below:
# vi /etc/udev/rules.d/99-my-asmdevices.rules
Add below content in 99-mydevices.rules file:
KERNEL=="sd*[!0-9]", ENV{DEVTYPE}=="disk", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id -g -u -d $devnode", RESULT=="1IET_00020002", RUN+="/bin/sh -c 'mknod /dev/asmdisk01p1 b $major $minor; chown grid:dba /dev/asmdisk01p1; chmod 0660 /dev/asmdisk01p1'"
Save the rule file.
3. Test new udev rule
Run below command or reboot to verify new udev rule
1. Check for new device name:
# udevadm trigger --type=devices --action=change # /bin/ls /dev/asmdisk01p1
2. To reload udev rule execute below command:
# udevadm control --reload
3. For Troubleshooting udev rule execute below command:
# udevadm test /sys/block/sdb
Removing Device File
Remember to manually remove the device file if you no longer need it. Simply use rm to delete the device file as shown below.
# rm /dev/asmdisk01p1