4. Its time for some system administrator tasks. Oracle ASM need special mark of disks will work with
4.1. Because of some reason (i don't know why) ASM can work only with partitions, but not with entire disks. So it is need to create one big partition on each disk
[root@rh-asm-ora ~]# fdisk /dev/sda
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 1044.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1044, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-1044, default 1044):
Using default value 1044
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
And the similar for the rest of the disks /dev/sdb, /dev/sdc, /dev/sdd, /dev/sde and /dev/sdf
4.2. Next step is to configure the ASMlib. This is done via init script
[root@rh-asm-ora ~]# /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 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 []: dba
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
Initializing the Oracle ASMLib driver: [ OK ]
Scanning the system for Oracle ASMLib disks: [ OK ]
If you do not get OK on the last line check /var/log/messages. Usual reason is you do not install the correct version of ASMlib. Check on this site Oracle ASMLib. If you cant find modules for your version of kernel you should compile them from source you can get from here: http://oss.oracle.com/projects/oracleasm/
4.3. And check if the kernel module is loaded
[root@rh-asm-ora ~]# lsmod |grep ora
oracleasm 46356 1
4.4. The module is loaded so lets label the disks to be recognized by Oracle ASM. I will dedicate 4 disks for tablespace and 2 disks for flashback
[root@rh-asm-ora ~]# /etc/init.d/oracleasm createdisk dfdisk0 /dev/sda1
Marking disk "dfdisk0" as an ASM disk: [ OK ]
[root@rh-asm-ora ~]# /etc/init.d/oracleasm createdisk dfdisk1 /dev/sdb1
Marking disk "dfdisk1" as an ASM disk: [ OK ]
[root@rh-asm-ora ~]# /etc/init.d/oracleasm createdisk dfdisk2 /dev/sdc1
Marking disk "dfdisk2" as an ASM disk: [ OK ]
[root@rh-asm-ora ~]# /etc/init.d/oracleasm createdisk dfdisk3 /dev/sdd1
Marking disk "dfdisk3" as an ASM disk: [ OK ]
[root@rh-asm-ora ~]# /etc/init.d/oracleasm createdisk fbdisk0 /dev/sde1
Marking disk "fbdisk0" as an ASM disk: [ OK ]
[root@rh-asm-ora ~]# /etc/init.d/oracleasm createdisk fbdisk1 /dev/sdf1
Marking disk "fbdisk1" as an ASM disk: [ OK ]
4.5. Check the ASM volumes
[root@rh-asm-ora ~]# /etc/init.d/oracleasm listdisks
DFDISK0
DFDISK1
DFDISK2
DFDISK3
FBDISK0
FBDISK1
5. The next step is install Oracle ASM software. This is mostly straight-forward process, so just read the installation guide and do it. Please do not forget in version 11gR2 Oracle ASM is part of Grid installation package and not standard Oracle Database installation package
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