使用ASMLib配置共享磁盘

一 安装ASMLIB

点击这里下载安装包。

#在所有rac节点上安装

rpm -ivh oracleasm-support-2.1.8-1.el6.x86_64.rpm

rpm -ivh kmod-oracleasm-2.0.8-13.el6_8.x86_64.rpm

rpm -ivh oracleasmlib-2.0.4-1.el6.x86_64.rpm

二 配置ASMLIB

#在所有rac节点上配置：

[root@rac1 opt]# oracleasm configure -i

Configuring the Oracle ASM library driver.

This will configure the on-boot properties of the Oracle ASM library

driver.  The following questions will determine whether the driver is

loaded on boot and what permissions it will have.  The current values

will be shown in brackets ('[]').  Hitting <ENTER> without typing an

answer will keep that current value.  Ctrl-C will abort.

Default user to own the driver interface []: grid

Default group to own the driver interface []: asmadmin

Start Oracle ASM library driver on boot (y/n) [n]: y

Scan for Oracle ASM disks on boot (y/n) [y]: y

Writing Oracle ASM library driver configuration: done

#查看配置

[root@rac1 opt]# oracleasm configure

ORACLEASM_ENABLED=true

ORACLEASM_UID=grid

ORACLEASM_GID=asmadmin

ORACLEASM_SCANBOOT=true

ORACLEASM_SCANORDER=""

ORACLEASM_SCANEXCLUDE=""

ORACLEASM_USE_LOGICAL_BLOCK_SIZE="false"

三 加载 oracleasm 内核模块

#在所有rac节点上执行：

[root@rac2 opt]#  /usr/sbin/oracleasm init

Creating /dev/oracleasm mount point: /dev/oracleasm

Loading module "oracleasm": oracleasm

Configuring "oracleasm" to use device physical block size

Mounting ASMlib driver filesystem: /dev/oracleasm

/*

该步骤完成以下任务：

• 创建 /etc/sysconfig/oracleasm 配置文件

• 创建 /dev/oracleasm 挂载点

• 挂载 ASMLib 驱动程序文件系统

*/

#检查状态

[root@rac2 opt]# oracleasm status

Checking if ASM is loaded: yes

Checking if /dev/oracleasm is mounted: yes

四 创建ASM磁盘

创建 ASM 磁盘只需在 RAC 集群中的一个节点上以 root 用户帐户执行。

4.1 对共享磁盘进行分区

这里以共享磁盘/dev/sdb为例

[root@rac1 opt]# fdisk /dev/sdbDevice contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabelBuilding a new DOS disklabel with disk identifier 0x15d3e0e7.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 toswitch off the mode (command 'c') and change display units tosectors (command 'u').Command (m for help): mCommand actiona   toggle a bootable flagb   edit bsd disklabelc   toggle the dos compatibility flagd   delete a partitionl   list known partition typesm   print this menun   add a new partitiono   create a new empty DOS partition tablep   print the partition tableq   quit without saving changess   create a new empty Sun disklabelt   change a partition's system idu   change display/entry unitsv   verify the partition tablew   write table to disk and exitx   extra functionality (experts only)Command (m for help): nCommand actione   extendedp   primary partition (1-4)pPartition number (1-4): 1First cylinder (1-2610, default 1):Using default value 1Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610):Using default value 2610Command (m for help): tSelected partition 1Hex code (type L to list codes): 8eChanged system type of partition 1 to 8e (Linux LVM)Command (m for help): pDisk /dev/sdb: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x15d3e0e7Device Boot      Start         End      Blocks   Id  System/dev/sdb1               1        2610    20964793+  8e  Linux LVMCommand (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.Syncing disks.

#查看分区

[root@rac1 opt]# fdisk -l /dev/sdb

Disk /dev/sdb: 21.5 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x15d3e0e7

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1        2610    20964793+  8e  Linux LVM

在其他节点上也能看到该分区：

4.2 创建ASM磁盘

oracleasm createdisk DATA /dev/sdb1

在其他RAC 节点上，需要执行 scandisk 以识别asm磁盘：

[root@rac2 opt]#  oracleasm scandisks

Reloading disk partitions: done

Cleaning any stale ASM disks...

Scanning system for ASM disks...

Instantiating disk "DATA"

#查看磁盘

[root@rac2 opt]#  oracleasm listdisks

DATA

[root@rac1 rpm]# oracleasm querydisk -p data
Disk "DATA" is a valid ASM disk
/dev/sdb1: LABEL="DATA" TYPE="oracleasm" 

--本篇文章主要参考了https://blog.csdn.net/XiaoHG_CSDN/article/details/113839926