Thursday, May 5, 2016

Configuring oracleasmLib On Linux

To use ASM on Linux, we need to create ASM disks, and using oracleasmLib is one way to configure ASM disks. To do this, we need to install oracleasm kernel driver, oracleasm-support and oracleasmlib, and then configure oracleasm.
oracleasm kernel driver is built in Oracle Linux and does not need to be installed. After installing oracleasm-support and oracleasmlib packages, oracleasm driver starts working.
If you are using some other flavor of Linux, for example RedHat Linux, then you would need to install all 3 packages (oracleasm driver, oracleasm-support and oracleasmlib).
Since I am using Oracle Linux, I would install oracle oracleasm-support and oracleasmlib.
Install oracleasm-support from yum repository or from Linux media, then download oracleasmlib package form the following URL, and install.
http://www.oracle.com/technetwork/server-storage/linux/asmlib/ol6-1709075.html

Install oracleasmlib and oracleasm-support
[root@salman1 ~]#  yum install oracleasm-support
[root@salman1 ~]#  rpm -i oracleasm-lib*

Configure oracleasm (highlighted in red are the inputs during configuration)
[root@salman1 ~]# /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 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
Scan for Oracle ASM disks on boot (y/n) [y]:y
Writing Oracle ASM library driver configuration: done
Initializing the Oracle ASMLib driver:                     [  OK  ]
Scanning the system for Oracle ASMLib disks:               [  OK  ]

Check Configuration
[root@salman1 ~]# /usr/sbin/oracleasm configure
ORACLEASM_UID=grid
ORACLEASM_GID=asmadmin
ORACLEASM_SCANBOOT=true
ORACLEASM_SCANORDER=""
ORACLEASM_SCANEXCLUDE=""
ORACLEASM_USE_LOGICAL_BLOCK_SIZE="false"

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