UDEV SCSI Rules Configuration for ASM in Oracle Linux 5 and 6

UDEV SCSI Rules Configuration for ASM in Oracle Linux 5 and 6

For Oracle Automatic Storage Manager (ASM) to use disks, it needs to be able to identify the devices consistently and for them to have the correct ownership and permissions. In Linux you can use ASMLib to manage these tasks, but it is seen as an additional
layer of complexity and has never really gained any popularity. Instead, many people use the Linux device manager "udev" to perform these tasks. This article presents a brief overview of setting up udev rules with respect to disks for use with ASM in Oracle
11g. The examples are all done using Oracle Linux 5 and 6, so they will be consistent with RHEL and CentOS 5 and 6.

Background

Essentially, what udev does is apply rules defined in files in the "/etc/udev/rules.d" directory to the device nodes listed in the "/dev" directory. The rules can be defined in a variety of ways, but what we need to do is identify the device and say what
we want udev to do with it.

In this case I know all my disk devices are named "/dev/sd?1", where the "?

" represents a letter from a-d, so I can identify the devices of interest using the following rule parameters.

KERNEL=="sd?1", BUS=="scsi"

I want to tie each specific device to an alias, so it is always identified the same way, regardless of the device name Linux assigns it. So I need to be able to test each device that matches the previous pattern to see if it is the disk I am interested in.
Each disk has a unique SCSI ID, so I can place a test into the rule, telling it how to perform the test, and the result it should return for a positive match. The following rule parameters explain how to test the device and what result constitutes a match
in Oracle Linux 5.

PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3_"

The scsi_id command works a little differently in Oracle Linux 6, so for that the following test works better.

PROGRAM=="/sbin/scsi_id -g -u -d /dev/$parent", RESULT=="SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3_"

Once we have identified the specific device of interest, we need to indicate what actions should be performed on it. The following parameters specify an alias, the ownership and the permissions for the device.

NAME="asm-disk1", OWNER="oracle", GROUP="dba", MODE="0660"

So the whole rule for each disk will look something like this in Oracle Linux 5.

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3_", NAME="asm-disk1", OWNER="oracle", GROUP="dba", MODE="0660"

Or this in Oracle Linux 6.

KERNEL=="sd?

1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -d /dev/$parent", RESULT=="SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3_", NAME="asm-disk1", OWNER="oracle", GROUP="dba", MODE="0660"

This means that the device pointing to the partition "sd*1" on the disk with the SCSI ID of "SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3_" will always be called "/dev/asm-disk1", regardless of the letter "?" Linux assigns when the device is discovered. In addition,
the device will have the correct ownership and permissions for ASM.

There are a number of wildcards and matching patterns that can be used if you don‘t want to write device-specific rules.

Now we know roughly what we are trying to achieve, we will look at each step necessary for setting up the disks for ASM to use.

Identify the Disks (/sbin/scsi_id)

We are going to write device-specific rules, so we need to be able to identify each device consistently, irrespective of the order in which Linux discovers it. To do this we are going to use the SCSI ID for each disk (not the partition), which we get using
the scsi_id command. The "-s" option makes the paths relative to the "/sys" directory. For Oracle Linux 5, use the following command.

# /sbin/scsi_id -g -u -s /block/sdb
SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3_
# /sbin/scsi_id -g -u -s /block/sdc
SATA_VBOX_HARDDISK_VB46dec7e0-192e8000_
# /sbin/scsi_id -g -u -s /block/sdd
SATA_VBOX_HARDDISK_VBce8c63bb-ac67a172_
# /sbin/scsi_id -g -u -s /block/sde
SATA_VBOX_HARDDISK_VB7437a3b7-95b199cd_
#

The "-s" is not available in Oracle Linux 6, so you must use the following syntax.

# /sbin/scsi_id -g -u -d /dev/sdb
SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3_
# /sbin/scsi_id -g -u -d /dev/sdc
SATA_VBOX_HARDDISK_VB46dec7e0-192e8000_
# /sbin/scsi_id -g -u -d /dev/sdd
SATA_VBOX_HARDDISK_VBce8c63bb-ac67a172_
# /sbin/scsi_id -g -u -d /dev/sde
SATA_VBOX_HARDDISK_VB7437a3b7-95b199cd_
#

Make SCSI Devices Trusted

Add the following to the "/etc/scsi_id.config" file to configure SCSI devices as trusted. Create the file if it doesn‘t already exist.

options=-g

Create UDEV Rules File

Create the "/etc/udev/rules.d/99-oracle-asmdevices.rules" file.

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

The file should contain the following lines for Oracle Linux 5. The PROGRAM parameter must match the command you used to retrieve the SCSI ID, and the
RESULT parameter must match the value returned from your disks.

KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3_", NAME="asm-disk1", OWNER="oracle", GROUP="dba", MODE="0660"
KERNEL=="sd?

1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="SATA_VBOX_HARDDISK_VB46dec7e0-192e8000_", NAME="asm-disk2", OWNER="oracle", GROUP="dba", MODE="0660"
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="SATA_VBOX_HARDDISK_VBce8c63bb-ac67a172_", NAME="asm-disk3", OWNER="oracle", GROUP="dba", MODE="0660"
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s /block/$parent", RESULT=="SATA_VBOX_HARDDISK_VB7437a3b7-95b199cd_", NAME="asm-disk4", OWNER="oracle", GROUP="dba", MODE="0660"

The equivalent for Oracle Linux 6 is shown below.

KERNEL=="sd?

1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -d /dev/$parent", RESULT=="SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3_", NAME="asm-disk1", OWNER="oracle", GROUP="dba", MODE="0660"
KERNEL=="sd?

1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -d /dev/$parent", RESULT=="SATA_VBOX_HARDDISK_VB46dec7e0-192e8000_", NAME="asm-disk2", OWNER="oracle", GROUP="dba", MODE="0660"
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -d /dev/$parent", RESULT=="SATA_VBOX_HARDDISK_VBce8c63bb-ac67a172_", NAME="asm-disk3", OWNER="oracle", GROUP="dba", MODE="0660"
KERNEL=="sd?1", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -d /dev/$parent", RESULT=="SATA_VBOX_HARDDISK_VB7437a3b7-95b199cd_", NAME="asm-disk4", OWNER="oracle", GROUP="dba", MODE="0660"

Load Updated Block Device Partitions (/sbin/partprobe)

Load updated block device partition tables.

# /sbin/partprobe /dev/sdb1
# /sbin/partprobe /dev/sdc1
# /sbin/partprobe /dev/sdd1
# /sbin/partprobe /dev/sde1

Test Rules (udevtest)

Test the rules are working as expected.

# #OL5
# udevtest /block/sdb/sdb1
# udevtest /block/sdc/sdc1
# udevtest /block/sdd/sdd1
# udevtest /block/sde/sde1

# #OL6
# udevadm test /block/sdb/sdb1
# udevadm test /block/sdc/sdc1
# udevadm test /block/sdd/sdd1
# udevadm test /block/sde/sde1

The output from the first disk should look something like this.

# udevtest /block/sdb/sdb1
main: looking at device ‘/block/sdb/sdb1‘ from subsystem ‘block‘
udev_rules_get_name: add symlink ‘disk/by-id/scsi-SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3-part1‘
udev_rules_get_name: add symlink ‘disk/by-path/pci-0000:00:0d.0-scsi-1:0:0:0-part1‘
run_program: ‘/lib/udev/vol_id --export /dev/.tmp-8-17‘
run_program: ‘/lib/udev/vol_id‘ returned with status 4
run_program: ‘/sbin/scsi_id -g -u -s /block/sdb/sdb1‘
run_program: ‘/sbin/scsi_id‘ (stdout) ‘SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3_‘
run_program: ‘/sbin/scsi_id‘ returned with status 0
udev_rules_get_name: rule applied, ‘sdb1‘ becomes ‘asm-disk1‘
udev_device_event: device ‘/block/sdb/sdb1‘ already in database, validate currently present symlinks
udev_node_add: creating device node ‘/dev/asm-disk1‘, major = ‘8‘, minor = ‘17‘, mode = ‘0660‘, uid = ‘1100‘, gid = ‘1200‘
udev_node_add: creating symlink ‘/dev/disk/by-id/scsi-SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3-part1‘ to ‘../../asm-disk1‘
udev_node_add: creating symlink ‘/dev/disk/by-path/pci-0000:00:0d.0-scsi-1:0:0:0-part1‘ to ‘../../asm-disk1‘
main: run: ‘socket:/org/kernel/dm/multipath_event‘
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/asm-disk1 /dev/disk/by-id/scsi-SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3-part1 /dev/disk/by-path/pci-0000:00:0d.0-scsi-1:0:0:0-part1‘
#

Restart UDEV Service

Restart the UDEV service.

# #OL5
# /sbin/udevcontrol reload_rules

# #OL6
# udevadm control --reload-rules

# #OL5 and OL6
# /sbin/start_udev

Check Ownership and Permissions

Check the disks are now available with the "asm-disk*" alias and the correct ownership and permissions.

# cd /dev
# ls -al asm-disk*
brw-rw---- 1 oracle dba 8, 17 Apr  8 22:47 asm-disk1
brw-rw---- 1 oracle dba 8, 33 Apr  8 22:47 asm-disk2
brw-rw---- 1 oracle dba 8, 49 Apr  8 22:47 asm-disk3
brw-rw---- 1 oracle dba 8, 65 Apr  8 22:47 asm-disk4
#

So the ASM_DISKSTRING initialization parameter in the ASM instance can be set to ‘/dev/asm-disk*‘ to identify the ASM disks.

时间： 2024-08-15 02:48:09

UDEV SCSI Rules Configuration for ASM in Oracle Linux 5 and 6的相关文章

如何用udev for asm in oracle linux 6

大部分在网上可以找到的文档都是在RHEL5或者OEL5中设置udev,udev对于Linux而言最大的作用是防止操作系统重新启动以后,作为ASM磁盘使用的盘符发生变化.比如说Tim Hall的文章:UDEV SCSI Rules Configuration for ASM in Oracle Linux 5.比如说Maclean的文章:利用UDEV服务解决RAC ASM存储设备名. 但是在OEL6或者RHEL6中,这一切都有所变化. 主要的变化是:1. scsi_id的命令语法发生了变化,scs

在Linux 5/6上使用UDEV SCSI规则配置ASM DISK

识别磁盘(/sbin/scsi_id)  Oracle Linux 5用如下脚本: #!/bin/sh for i in b c d e f g do echo "KERNEL==\"sd*\", BUS==\"scsi\", PROGRAM==\"/sbin/scsi_id -g -u -s /block/\$name\", RESULT==\"`/sbin/scsi_id /block/sd$i`\", NAME

在SUSE Linux Enterprise 11 SP1上用UDEV SCSI配置ASM

1. 编辑/etc/scsi_id.config文件,如果该文件不存在,则创建该文件,添加如下行: options=–whitelisted –replace-whitespace 2. 获取需要绑定为ASM Disk的磁盘uuid,比如我们要使用/dev/sdc和/dev/sdd作为ASM磁盘,那么: # /lib/udev/scsi_id –whitelisted –replace-whitespace –device=/dev/sdc 1ATA_VBOX_HARDDISK_VB36a9e5

udev和rules使用规则

本文以通俗的方法阐述 udev 及相关术语的概念.udev 的配置文件和规则文件,然后以 Red Hat Enterprise Server 为平台演示一些管理设备文件和查询设备信息的实例.本文会使那些需要高效地.方便地管理 Linux 设备的用户受益匪浅,这些用户包括 Linux 最终用户.设备驱动开发人员.设备测试人员和系统管理员等等. 概述: Linux 用户常常会很难鉴别同一类型的设备名,比如 eth0, eth1, sda, sdb 等等.通过观察这些设备的内核设备名称,用户通常能知道

ORACLE LINUX 6.3 + ORACLE 11.2.0.3 RAC + VBOX安装文档

ORACLE LINUX 6.3 + ORACLE 11.2.0.3 RAC + VBOX安装文档 2015-10-21 12:51 525人阅读 评论(0) 收藏 举报  分类: Oracle RAC 版权声明:本文为博主原创文章,未经博主允许不得转载. VBOX + Oracle Linux 6U3 + ORACLE 11.2.0.3.0 RAC 安装 环境: 虚拟机          VIRTUAL BOX OS                ORACLE LINUX 6.3_X86_64

Oracle linux 6.3 安装11g R2 RAC on vbox

1 安装系统 Virtual box 4.3 Oracle linux 6.3 Oracle 11g r2 Make sure "Adapter 1" is enabled, set to "Bridged Adapter", then click on the "Adapter 2" tab. Make sure "Adapter 2" is enabled, set to "Bridged Adapter&quo

oracle linux 6.5 安装 oracle 12cR2数据库(3)-手工静默建CDB库

? 参考步骤: dbca -silent -createDatabase -templateName General_Purpose.dbc -gdbname oradb.example.com -sid oradb -responseFile NO_VALUE -characterSet AL32UTF8 -memoryPercentage 30 -emConfiguration LOCAL ? Enter SYSTEM user password: password Enter SYS us

oracle linux 4.8安装oracl 10g rac错误解决

1.初使化asm自动存储驱动出错,找不到模块 [[email protected] Desktop]# /etc/init.d/oracleasm configure Configuring the Oracle ASM library driver. This will configure the on-boot properties of the Oracle ASM library driver.  The following questions will determine whethe

Oracel 12cR1 install for Oracle Linux 6.6

Oracel 12cR1install for Oracle Linux 6.5 一.安装前准备 1. 软件下载: Database software: db12102_V46095-01_1of2.zip db12102_V46095-01_2of2.zip 下载地址: http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html 或是:http://edelivery.oracle.com