This article will show to install ASM support with ASMLib for Oracle Linux 7 in command line only.
ASMLib is an optional support library for the Automatic Storage Management feature of the Oracle Database. Automatic Storage Management (ASM) simplifies database administration and greatly reduces kernel resource usage (e.g. the number of open file descriptors). It eliminates the need for the DBA to directly manage potentially thousands of Oracle database files, requiring only the management of groups of disks allocated to the Oracle Database. ASMLib allows an Oracle Database using ASM more efficient and capable access to the disk groups it is using.
The Oracle ASMLib kernel driver is now included in the Unbreakable Enterprise Kernel. No driver package needs to be installed when using this kernel.
In this article, you'll need ...
... Oracle Linux 7 installed with UEK (see oel7 installation here)
... root access is needed
... internet access is needed
License free ...
From mid-September 2014, all Oracle ACFS features are free to use in 11g and 12c.
Only ACFS snapshot feature requires Oracle Database Enterprise Edition (see licensing information here)
From Oracle 12c, you may want to check ASMFD instead (here)
Disable SELinux
With SELinux activated, oracleasm module may not start with the following error:
Creating /dev/oracleasm mount point: mkdir: cannot create directory '/dev/oraclesm': Permission denied
failed
Unable to create mount point /dev/oracleasm
Edit /etc/selinux/config config file and set SELINUX to "disabled" or "permissive":
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of these two values:
# targeted - Targeted processes are protected,
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
And execute the following commands as root to immediately disable SELinux:
# Disable SELinux
[root]$ /usr/sbin/setenforce 0
# Check current SELinux configuration
[root]$ /usr/sbin/getenforce
Permissive
Install ASM support
To install oracleasm-support package, simply execute the following command as root:
[root]$ yum install oracleasm-support
Loaded plugins: langpacks
Resolving Dependencies
--> Running transaction check
---> Package oracleasm-support.x86_64 0:2.1.8-3.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
===================================================================================================================================
Package Arch Version Repository Size
===================================================================================================================================
Installing:
oracleasm-support x86_64 2.1.8-3.el7 ol7_latest 79 k
Transaction Summary
===================================================================================================================================
Install 1 Package
Total download size: 79 k
Installed size: 242 k
Is this ok [y/d/N]: y
Downloading packages:
oracleasm-support-2.1.8-3.el7.x86_64.rpm | 79 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : oracleasm-support-2.1.8-3.el7.x86_64 1/1
Note: Forwarding request to 'systemctl enable oracleasm.service'.
ln -s '/usr/lib/systemd/system/oracleasm.service' '/etc/systemd/system/multi-user.target.wants/oracleasm.service'
Verifying : oracleasm-support-2.1.8-3.el7.x86_64 1/1
Installed:
oracleasm-support.x86_64 0:2.1.8-3.el7
Complete!
Initialize ASM
As you can see below, oracle asm service is enabled and asm kernel driver is installed but not running/loaded yet.
#check if oracleasm service is activated
[root]$ systemctl is-enabled oracleasm.service
enabled
#check if oracleasm module is loaded into Linux kernel
[root]$ lsmod | grep oracleasm
#check if oracleasm kernel module is installed
[root]$ modinfo oracleasm
filename: /lib/modules/3.8.13-35.3.1.el7uek.x86_64/kernel/drivers/block/oracleasm/oracleasm.ko
description: Kernel driver backing the Generic Linux ASM Library.
author: Joel Becker
version: 2.0.8
license: GPL
srcversion: A311C50149C77E13C360349
depends:
intree: Y
vermagic: 3.8.13-35.3.1.el7uek.x86_64 SMP mod_unload modversions
signer: Oracle CA Server
sig_key: C8:F6:00:04:DB:C9:C1:D4:E9:DD:B8:57:24:12:44:BA:7D:A9:55:6C
sig_hashalgo: sha256
parm: use_logical_block_size:Prefer logical block size over physical (Y=logical, N=physical [default]) (bool)
We need to initialize oracleasm module in order to load it into the kernel.
#init oracleasm module
[root]$ /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
#check if oracleasm module is loaded into Linux kernel
[root]$ lsmod | grep oracleasm
oracleasm 53453 1
Configure ASM
#configure ASM
#configure ASM
[root]$ /usr/sbin/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 []: oinstall
Scan for Oracle ASM disks on boot (y/n) [y]:
Writing Oracle ASM library driver configuration: done
Create ASM disks
#Create disk partition
[root]$ for disk in sdc sdd sde sdh sdi sdj; do
fdisk /dev/$disk << _EOF_
n
p
w
_EOF_
done
#Create ASM disk for DATA
[root]$ i=0; for disk in sdc1 sdd1 sde1; do i=$(( i+1 )); oracleasm createdisk ORADATVOL$i /dev/$disk; done
Writing disk header: done
Instantiating disk: done
Writing disk header: done
Instantiating disk: done
Writing disk header: done
Instantiating disk: done
#Create ASM disk for FRA
[root]$ i=0; for disk in sdh1 sdi1 sdj1; do i=$(( i+1 )); oracleasm createdisk ORAFRAVOL$i /dev/$disk; done
Writing disk header: done
Instantiating disk: done
Writing disk header: done
Instantiating disk: done
Writing disk header: done
Instantiating disk: done
#List ASM disks
[root]$ oracleasm listdisks
ORADATVOL1
ORADATVOL2
ORADATVOL3
ORAFRAVOL1
ORAFRAVOL2
ORAFRAVOL3
[root]$ ls -l /dev/oracleasm/disks
total 0
brw-rw----. 1 grid oinstall 8, 33 May 22 17:29 ORADATVOL1
brw-rw----. 1 grid oinstall 8, 49 May 22 17:29 ORADATVOL2
brw-rw----. 1 grid oinstall 8, 65 May 22 17:29 ORADATVOL3
brw-rw----. 1 grid oinstall 8, 113 May 22 17:45 ORAFRAVOL1
brw-rw----. 1 grid oinstall 8, 129 May 22 17:45 ORAFRAVOL2
brw-rw----. 1 grid oinstall 8, 145 May 22 17:45 ORAFRAVOL3
Please leave comments and suggestions,
Michel.
Reference
ASMLib Installation - Oracle (here)
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Comments
on my OEL7 system does oracleasm not start after reboot. I'am right, that I have to start oracleasm manually after restart the server?
As root user,
- Make sure you have disabled SELinux as explained in this article.
- And check if the asm service is enabled with: $ systemctl is-enabled oracleasm.service
- If not, enabled it with: $ systemctl enable oracleasm.service
Under OEL6 was it execute automaticly. Did you have a solution for this?
Thanks
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