Automatic Stroage Management (ASM): Adding a disk to a existing Diskgroup

Automatic Storage Management:
Adding a Disk to an existing Disk Group:
Oracle 10G RAC:
In day to day activities DBA needs plan and assign storage to the growing database. It’s a brief idea & procedure about how to add a new disk to an existing disk groups.
* Please refer my other posts on ASM and Linux VMware for adding Disks (Shortly edited)
1. Login as a root user and check for the new disk which was just added at the VMware.
[root@rac1 ~]# fdisk -l
Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
[…Truncated]
Disk /dev/sdf doesn't contain a valid partition table
2. Use fdisk to create the partition info for the newly added disk.
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[root@rac1 ~]# fdisk /dev/sdf
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.
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 (1-261, default 1): 1
Last cylinder or +size or +sizeM or +sizeK (1-261, default 261):
Using default value 261
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
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3. You can see the new partition info; you can do this on both the Cluster nodes.
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[root@rac1 ~]# fdisk -l
Disk /dev/sdf: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdf1 1 261 2096451 83 Linux
[root@rac1 ~]#
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NODE 02
[root@rac2 ~]# fdisk -l
Disk /dev/sdf: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdf1 1 261 2096451 83 Linux
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4. In Linux you can use ASM library driver provided by Oracle to configure the new disks.
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oracleasm-support-2.0.3-2
oracleasm-2.6.9-42.0.0.0.1.EL-2.0.3-2
oracleasmlib-2.0.2-1
oracleasm-2.6.9-42.0.0.0.1.ELsmp-2.0.3-2
NODE 01 # Check for existing ASM disks
[root@rac1 ~]# /etc/init.d/oracleasm scandisks
Scanning system for ASM disks: [ OK ]
[root@rac1 ~]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
NODE 02 # Check for existing ASM disks
[root@rac2 ~]# /etc/init.d/oracleasm scandisks
Scanning system for ASM disks: [ OK ]
[root@rac2 ~]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
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5. Create ASM disks. Do this on any one node as a root user.
[root@rac1 ~]# /etc/init.d/oracleasm createdisk VOL4 /dev/sdf1
Marking disk "/dev/sdf1" as an ASM disk: [ OK ]
[root@rac1 ~]# /etc/init.d/oracleasm scandisks
Scanning system for ASM disks: [ OK ]
[root@rac1 ~]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
VOL4
Check the ASM Disks from NODE 2
[root@rac2 ~]# /etc/init.d/oracleasm scandisks
Scanning system for ASM disks: [ OK ]
[root@rac2 ~]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
VOL4
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6. Configure X-Windows and run DBCA as a oracle user from the primary node, to add the disk to a existing disk group.
7. DBCA: Welcome screen: Select Oracle Real Application clusters database
8. DBCA: Operations Screen: Select Configure Automatic Storage Management ->NEXT
9. Node Selection: Select both the nodes -> Next
10. ASM Disk Groups: Select the Disk Group Name, to assing a new disk
11. Add Disks Screen: Select VOL4, we added before with ASM library
This ends up adding space to a existing Disk group.

** This is for knowledge purpose of knowing how and was experimented on free version software and Operating systems.

Please refer other posts on Linux VMware & Oracle ASM.