如何使用UDEV（非ASMLIB）设置分区化的Linux块设备并将它们分配给ASM？

本文档适用于

Oracle数据库 - 标准版 - 版本10.2.0.1至12.1.0.2 [发行版10.2至12.1]
Oracle数据库 - 企业版 - 版本12.1.0.2至12.1.0.2 [发行版12.1]
本文档中的信息适用于任何平台。

目标

本文档提供了一个示例，说明如何使用udev（非ASMLIB）设置/配置分区化的Linux块设备，并将它们作为ASM的候选成员磁盘分配给ASM。

解决方案

此示例在OEL 6.3配置上执行（ASM版本11.2.0.3 - 64位）：

[grid@asmlnx2 ~]$ uname -a
Linux asmlnx2 2.6.39-200.24.1.el6uek.x86_64 #1 SMP Sat Jun 23 02:39:07 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux

[grid@asmlnx2 ~]$ cat /etc/*release*
Oracle Linux Server release 6.3
Red Hat Enterprise Linux Server release 6.3 (Santiago)
Oracle Linux Server release 6.3

在您的Linux配置中识别新磁盘（例如OEL 6.3或RedHat 6.3）：

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[grid@asmlnx2 ~]$ ls -l  /dev/xvdv
brw-rw---- 1 root disk 202, 5376 Feb 11 21:31 /dev/xvdv

在其上创建一个新的磁盘分区：

[root@asmlnx2 ~]#  fdisk  /dev/xvdv
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xba335ded.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-261, default 1): 
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-261, default 261): 
Using default value 261

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
 
[root@asmlnx2 ~]# partprobe  /dev/xvdv
 
[root@asmlnx2 ~]# partprobe  /dev/xvdv1
 
[root@asmlnx2 ~]# ls -l  /dev/xvdv
brw-rw---- 1 root disk 202, 5376 Feb 11 21:38 /dev/xvdv
 
[root@asmlnx2 ~]# ls -l  /dev/xvdv1
brw-rw---- 1 root disk 202, 5377 Feb 11 21:38 /dev/xvdv1

按照以下方式在新的分区（“/dev/xvdv1”）上设置新的UDEV规则：

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[root@asmlnx2 ~]# vi /etc/udev/rules.d/99-oracle-asmdevices.rules
KERNEL=="xv*", BUS=="scsi", PROGRAM=="/sbin/scsi_id -g -u -s %p", RESULT=="360a98000375331796a3f434a55354474", NAME="asmdisk1_udev_p1", ACTION=="add|change", OWNER="grid", GROUP="asmadmin", MODE="0660"

重新加载并重启udev规则：

[root@asmlnx2 ~]# udevadm control --reload-rules

[root@asmlnx2 ~]# start_udev
Starting udev:                                             [  OK  ]

注意：运行“start_udev”将导致网络热插拔动作应用于主机上每个没有设置HOTPLUG=no的接口配置文件。这将激活任何没有设置HOTPLUG=no的接口，无论ONBOOT设置如何。如果您希望避免这种情况，请确保每个ifcfg文件都设置了HOTPLUG=no。

确保新创建的udev分区设备具有正确的所有权（grid & asmadmin）和权限（brw-rw—-）：

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[root@asmlnx2 ~]# ls -ltr /dev/asm*
brw-rw---- 1 grid asmadmin 202, 5377 Feb 11 21:47 /dev/asmdisk1_udev_p1

现在，您可以使用它来创建一个新的磁盘组，或者按照以下方式将其添加到现有的磁盘组中：

[root@asmlnx2 ~]# su - grid
[grid@asmlnx2 ~]$ . oraenv
ORACLE_SID = [grid] ? +ASM
The Oracle base has been set to /u01/app/grid
[grid@asmlnx2 ~]$ sqlplus "/as sysasm"

SQL*Plus: Release 11.2.0.3.0 Production on Mon Feb 11 21:56:31 2013

Copyright (c) 1982, 2011, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Automatic Storage Management option


SQL> show parameter asm_diskstring

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
asm_diskstring                       string


SQL> alter system set asm_diskstring = '/dev/asmdisk1_udev_p1' scope=both;

System altered.


SQL> show parameter  asm_diskstring

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
asm_diskstring                       string       /dev/asmdisk1_udev_p1



SQL> select path from v$asm_disk where path like '%udev%';

PATH
--------------------------------------------------------------------------------
/dev/asmdisk1_udev_p1


SQL> create diskgroup UDEVDG external redundancy disk '/dev/asmdisk1_udev_p1'  ;

Diskgroup created.