什么是ORACLE ASMLib？

ASMLib 是一個適用于 Oracle 數據庫?的自動存儲管理(ASM)功能的支持庫。ASM簡化了數據庫和管理，它不再需要 DBA 直接管理可能數千個的 Oracle 數據庫文件，而只需管理分配給 Oracle 數據庫的磁盤組。ASMLib 令使用 ASM 的 Oracle 數據庫更加高效，并能夠訪問它正在使用的磁盤組。

ORACLE ASMLib的獲取

oracleasm-support-version.arch.rpm

oracleasm-kernel-version.arch.rpm

oracleasmlib-version.arch.rpm

oracleasmlib 程序包提供實際的 ASM 庫。oracleasm-support 程序包提供用來使 ASM 驅動程序啟動并運行的公用程序。oracleasm-kernel程序包為 ASM 庫提供內核驅動程序， 這個與操作系統當前使用的內核版本密切相關。以我所使用的RHEL5.11 x86_64為例，通過uname -r得知系統內核版本為2.6.18-398.el5，所下載的程序包為：

oracleasm-2.6.18-398.el5-2.0.5-1.el5.x86_64.rpm

oracleasmlib-2.0.4-1.el5.x86_64.rpm

oracleasm-support-2.1.8-1.el5.x86_64.rpm

安裝ASMLib

用root用戶安裝下載的包，按以下順序安裝：

rpm -Uvh oracleasm-support-2.1.8-1.el5.x86_64.rpm

rpm -Uvh oracleasm-2.6.18-398.el5-2.0.5-1.el5.x86_64.rpm

rpm -Uvh oracleasmlib-2.0.4-1.el5.x86_64.rpm

配置ASMLib

[root@localhost ~]# 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 without typing an

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

Default user to own the driver interface []: oracle

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

創建ASM磁盤

[root@localhost ~]# oracleasm createdisk DISK1 /dev/sdb1

Writing disk header: done

Instantiating disk: done

[root@localhost ~]# oracleasm createdisk DISK2 /dev/sdb2

Writing disk header: done

Instantiating disk: done

[root@localhost ~]# oracleasm createdisk DISK3 /dev/sdb3

Writing disk header: done

Instantiating disk: done

[root@localhost ~]# oracleasm createdisk DISK4 /dev/sdb5

Writing disk header: done

Instantiating disk: done

[root@localhost ~]# oracleasm createdisk DISK5 /dev/sdb6

Writing disk header: done

Instantiating disk: done

[root@localhost ~]# oracleasm listdisks

DISK1

DISK2

DISK3

DISK4

DISK5

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