EXT3 to RAW file system

Question

hi all,
i have RHEL as 4 and i have 3 partitions on 200gb hard disk d01 d02 d03 with ext3 file system now i want to change the d01 ext3 file system to raw partition for implementing ASM can some one help me out that would be great help thanks very much in advance.

Answer 1

1. make a backup of your database
2. decide if you want to use ASMlib or raw devices
the following is the text in an article on installing oracle 10g (http://www.oracle.com/technology/pub/articles/chan-ubl-vmware.html#5)
A raw device mapping is required only if you are planning on creating ASM disks using standard Linux I/O. An alternative to creating ASM disks is to use the ASM library driver provided by Oracle. You will configure ASM disks using ASM library driver later.
Perform the following tasks to map the raw devices to the shared partitions created earlier. The raw devices have to bind with the block devices each time a cluster node boots.
Add the following lines in /etc/sysconfig/rawdevices.
/etc/sysconfig/rawdevices
/dev/raw/raw1 /dev/sdc1
/dev/raw/raw2 /dev/sdd1
/dev/raw/raw3 /dev/sde1
To make the mapping effective immediately, execute the following commands as the root user:
# /sbin/service rawdevices restart
Assigning devices:
/dev/raw/raw1 --> /dev/sdc1
/dev/raw/raw1: bound to major 8, minor 33
/dev/raw/raw2 --> /dev/sdd1
/dev/raw/raw2: bound to major 8, minor 49
/dev/raw/raw3 --> /dev/sde1
/dev/raw/raw3: bound to major 8, minor 65
done
# chown oracle:dba /dev/raw/raw[1-3]
# chmod 660 /dev/raw/raw[1-3]
# ls -lat /dev/raw/raw*
crw-rw---- 1 oracle dba 162, 3 Nov 4 07:04 /dev/raw/raw3
crw-rw---- 1 oracle dba 162, 2 Nov 4 07:04 /dev/raw/raw2
crw-rw---- 1 oracle dba 162, 1 Nov 4 07:04 /dev/raw/raw1
As the oracle user, execute
rac1-> ln -sf /dev/raw/raw1 /u01/oradata/devdb/asmdisk1
rac1-> ln -sf /dev/raw/raw2 /u01/oradata/devdb/asmdisk2
rac1-> ln -sf /dev/raw/raw3 /u01/oradata/devdb/asmdisk3
Modify /etc/udev/permissions.d/50-udev.permissions. Raw devices are remapped on boot. The ownership of the raw devices will change to the root user by default upon boot. ASM will have problem accessing the shared partitions if the ownership is not the oracle user. Comment the original line, “raw/*:root:disk:0660” in /etc/udev/permissions.d/50-udev.permissions and add a new line, “raw/*:oracle:dba:0660.”
/etc/udev/permissions.d/50-udev.permissions
# raw devices
ram*:root:disk:0660
#raw/*:root:disk:0660
raw/*:oracle:dba:0660