Adding disks to ASM library

[root@rac1 Desktop]# cd /dev

[root@rac1 dev]# ls sd*
sda  sda1  sda2  sdb  sdb1  sdc  sdc1  sdd  sdd1  sde  sde1  sdf  sdg

[root@rac1 dev]# /usr/sbin/oracleasm listdisks
DISK1
DISK2
DISK3
DISK4

[root@rac1 dev]# fdisk /dev/sdf

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xd8725891.
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)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-652, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-652, default 652):
Using default value 652

Command (m for help): p

Disk /dev/sdf: 5368 MB, 5368709120 bytes
255 heads, 63 sectors/track, 652 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xd8725891

   Device Boot      Start         End      Blocks   Id  System
/dev/sdf1               1         652     5237158+  83  Linux

Command (m for help): w        
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

[root@rac1 dev]# ls sd*
sda  sda1  sda2  sdb  sdb1  sdc  sdc1  sdd  sdd1  sde  sde1  sdf  sdf1  sdg

[root@rac1 dev]# fdisk /dev/sdg
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x3ca5b760.
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)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-652, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-652, default 652):
Using default value 652

Command (m for help): p

Disk /dev/sdg: 5368 MB, 5368709120 bytes
255 heads, 63 sectors/track, 652 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x3ca5b760

   Device Boot      Start         End      Blocks   Id  System
/dev/sdg1               1         652     5237158+  83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root@rac1 dev]# ls sd*
sda  sda1  sda2  sdb  sdb1  sdc  sdc1  sdd  sdd1  sde  sde1  sdf  sdf1  sdg  sdg1

[root@rac1 dev]# /usr/sbin/oracleasm createdisk DISK5 /dev/sdf1
Writing disk header: done
Instantiating disk: done

[root@rac1 dev]# /usr/sbin/oracleasm createdisk DISK6 /dev/sdg1
Writing disk header: done
Instantiating disk: done

[root@rac1 dev]# /usr/sbin/oracleasm scandisks
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...

[root@rac1 dev]# /usr/sbin/oracleasm listdisks
DISK1
DISK2
DISK3
DISK4
DISK5
DISK6

[root@rac1 dev]#