Configure UDEV Rules for Oracle ASM
Table of Contents
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a. Create OS user and groups for Oracle ASM disk owner
b. Add RAW disks to server (Check with sysadmin)
Configure UDEV Rules for Oracle ASM:
1. List the disks
2. Create partitions for the disks
3. Load updated block device partition tables
4. Find SCSI ID
5. Create udev rules
6. Reload the udev rules
7. List oracleasm disks
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Pre-requisites
a. Create OS user and groups for Oracle ASM disk owner
http://www.br8dba.com/create-users-groups-and-paths-for-oracle-rac/
| Operating System | Red Hat Enterprise Linux release 8.7 |
|---|---|
| Storage | |
| /dev/sda | 100G for Linux and others |
| /dev/sdb | 100G for /u01 |
| /dev/sdc | 100G for /orabackup |
| /dev/sdd | 100G for ASM DISK |
| /dev/sde | 100G for ASM DISK |
Configure UDEV Rules for Oracle ASM
If ASMLIB kernel drivers are not available then we have to use udev rules to create the disks for Oracle ASM.
Setting up Oracle ASM udev rules is not so complicated. All you need is the udevadm command and editing one file.
[root@testbox ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 100G 0 disk ├─sda1 8:1 0 1G 0 part /boot └─sda2 8:2 0 99G 0 part ├─ol-root 252:0 0 61.2G 0 lvm / ├─ol-swap 252:1 0 7.9G 0 lvm [SWAP] └─ol-home 252:2 0 29.9G 0 lvm /home sdb 8:16 0 100G 0 disk └─sdb1 8:17 0 100G 0 part /u01 sdc 8:32 0 100G 0 disk └─sdc1 8:33 0 100G 0 part /orabackup sdd 8:48 0 100G 0 disk sde 8:64 0 100G 0 disk sr0 11:0 1 47.3M 0 rom [root@testbox ~]#
2. Create partitions for the disks
fdisk /dev/sdd fdisk /dev/sde [root@testbox ~]# fdisk /dev/sdd Welcome to fdisk (util-linux 2.32.1). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. Device does not contain a recognized partition table. Created a new DOS disklabel with disk identifier 0x8c782d71. Command (m for help): n Partition type p primary (0 primary, 0 extended, 4 free) e extended (container for logical partitions) Select (default p): Using default response p. Partition number (1-4, default 1): First sector (2048-209715199, default 2048): Last sector, +sectors or +size{K,M,G,T,P} (2048-209715199, default 209715199): Created a new partition 1 of type 'Linux' and of size 100 GiB. Command (m for help): w The partition table has been altered. Calling ioctl() to re-read partition table. Syncing disks. [root@testbox ~]# [root@testbox ~]# fdisk /dev/sde Welcome to fdisk (util-linux 2.32.1). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. Device does not contain a recognized partition table. Created a new DOS disklabel with disk identifier 0x36462c72. Command (m for help): n Partition type p primary (0 primary, 0 extended, 4 free) e extended (container for logical partitions) Select (default p): Using default response p. Partition number (1-4, default 1): First sector (2048-209715199, default 2048): Last sector, +sectors or +size{K,M,G,T,P} (2048-209715199, default 209715199): Created a new partition 1 of type 'Linux' and of size 100 GiB. Command (m for help): w The partition table has been altered. Calling ioctl() to re-read partition table. Syncing disks. [root@testbox ~]#
3. Load updated block device partition tables
# For Linux 5,6 and 7 # /sbin/partprobe /dev/sdd1 # /sbin/partprobe /dev/sde1 # For Linux8 [root@testbox ~]# /sbin/partx -u /dev/sdd1 [root@testbox ~]# [root@testbox ~]# /sbin/partx -u /dev/sde1 [root@testbox ~]#
[root@testbox ~]# /usr/lib/udev/scsi_id -g -u -d /dev/sdd 1ATA_VBOX_HARDDISK_VB0adc00d9-c5938e95 [root@testbox ~]# [root@testbox ~]# /usr/lib/udev/scsi_id -g -u -d /dev/sde 1ATA_VBOX_HARDDISK_VBdaa5e829-52e4b9b1 [root@testbox ~]#
[root@testbox ~]# ls -ltr /etc/udev/rules.d total 12 -rw-r--r--. 1 root root 67 Oct 2 18:03 69-vdo-start-by-dev.rules -rw-r--r--. 1 root root 148 Nov 9 06:11 99-vmware-scsi-timeout.rules -rw-r--r--. 1 root root 134 Apr 1 07:52 60-vboxadd.rules [root@testbox ~]# vi /etc/udev/rules.d/99-oracle-asmdevices.rules and below lines and then save it. KERNEL=="sd?1", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id -g -u -d /dev/$parent", RESULT=="1ATA_VBOX_HARDDISK_VB0adc00d9-c5938e95", SYMLINK+="oracleasm/disks/DISK01", OWNER="grid", GROUP="asmadmin", MODE="0660" KERNEL=="sd?1", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id -g -u -d /dev/$parent", RESULT=="1ATA_VBOX_HARDDISK_VBdaa5e829-52e4b9b1", SYMLINK+="oracleasm/disks/DISK02", OWNER="grid", GROUP="asmadmin", MODE="0660" [root@testbox ~]# cat /etc/udev/rules.d/99-oracle-asmdevices.rules KERNEL=="sd?1", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id -g -u -d /dev/$parent", RESULT=="1ATA_VBOX_HARDDISK_VB0adc00d9-c5938e95", SYMLINK+="oracleasm/disks/DISK01", OWNER="grid", GROUP="asmadmin", MODE="0660" KERNEL=="sd?1", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id -g -u -d /dev/$parent", RESULT=="1ATA_VBOX_HARDDISK_VBdaa5e829-52e4b9b1", SYMLINK+="oracleasm/disks/DISK02", OWNER="grid", GROUP="asmadmin", MODE="0660" [root@testbox ~]# [root@testbox ~]# ls -ltr /etc/udev/rules.d/99-oracle-asmdevices.rules -rw-r--r--. 1 root root 428 Apr 2 02:18 /etc/udev/rules.d/99-oracle-asmdevices.rules [root@testbox ~]#
The below commands will reload the complete udev configuration and will trigger all the udev rules. On a busy production system this could disrupt ongoing operations, applications running on the server. Please use the below command during a scheduled maintenance window only. [root@testbox ~]# /sbin/udevadm control --reload-rules [root@testbox ~]# [root@testbox ~]# ls -ld /dev/sd*1 brw-rw----. 1 root disk 8, 1 Apr 2 02:23 /dev/sda1 brw-rw----. 1 root disk 8, 17 Apr 2 02:23 /dev/sdb1 brw-rw----. 1 root disk 8, 33 Apr 2 02:23 /dev/sdc1 brw-rw----. 1 root disk 8, 49 Apr 2 02:23 /dev/sdd1 brw-rw----. 1 root disk 8, 65 Apr 2 02:23 /dev/sde1 [root@testbox ~]# [root@testbox ~]# /sbin/udevadm trigger [root@testbox ~]# [root@testbox ~]# ls -ld /dev/sd*1 brw-rw----. 1 root disk 8, 1 Apr 2 02:34 /dev/sda1 brw-rw----. 1 root disk 8, 17 Apr 2 02:34 /dev/sdb1 brw-rw----. 1 root disk 8, 33 Apr 2 02:34 /dev/sdc1 brw-rw----. 1 grid asmadmin 8, 49 Apr 2 02:34 /dev/sdd1 brw-rw----. 1 grid asmadmin 8, 65 Apr 2 02:34 /dev/sde1 [root@testbox ~]#
[root@testbox ~]# ls -ltra /dev/oracleasm/disks/* lrwxrwxrwx. 1 root root 10 Apr 2 02:34 /dev/oracleasm/disks/DISK01 -> ../../sdd1 lrwxrwxrwx. 1 root root 10 Apr 2 02:34 /dev/oracleasm/disks/DISK02 -> ../../sde1 [root@testbox ~]# [root@testbox ~]# ls -ld /dev/sd*1 brw-rw----. 1 root disk 8, 1 Apr 2 02:34 /dev/sda1 brw-rw----. 1 root disk 8, 17 Apr 2 02:34 /dev/sdb1 brw-rw----. 1 root disk 8, 33 Apr 2 02:34 /dev/sdc1 brw-rw----. 1 grid asmadmin 8, 49 Apr 2 02:34 /dev/sdd1 brw-rw----. 1 grid asmadmin 8, 65 Apr 2 02:34 /dev/sde1 [root@testbox ~]# Note: symboliclinks are owned by root, but devices will be owned by grid:asmadmin
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Thank you,
Rajasekhar Amudala
Email: br8dba@gmail.com
Linkedin: https://www.linkedin.com/in/rajasekhar-amudala/