Red Hat ENTERPRISE LINUX AS 2.1 - Instalační příručka stáhnout pdf (Strana 45)

Using Raw Devices for Oracle Databases

/dev/raw/raw100 /dev/sdz

13.3. Using Raw Devices for Oracle Databases

Many guides and documentations show instructions on using the devices in /dev/raw/ for

configuring raw devices for data files. It is not recommend to use the raw devices in /dev/raw/

for the following reason: When you configure raw devices for Oracle data files, you also have to

change ownership and permissions of the devices in /dev/raw/ to allow Oracle to read and write

to these raw devices. But all device names in /dev/raw/ are owned by the dev RPM. So when

the Linux systems administrator upgrades the dev RPM, which may happen as part of an operating

system update, then all device names in /dev/raw/ will automatically be recreated. This means

that ownership and permissions must be set each time the dev RPM gets upgraded. Therefore it is

recommend to create all raw devices for Oracle datafiles in an Oracle data directory such as /u02.

For example, to create a new raw device for the system data file system01.dbf in /u02/orcl/,

execute the following command:

# mknod /u02/orcl/system01.dbf c 162 1

This command creates a new raw device called /u02/orcl/system01.dbf with minor number 1,

which is equivalent to the first raw device /dev/raw/raw1. The major number 162 designates the

device as a raw device. A major number always identifies the driver associated with the device.

To grant oracle:dba read and write permissions, execute:

# chown oracle.dba /u02/orcl/system01.dbf

# chown 660 /u02/orcl/system01.dbf

To bind this new raw device to the first partition of /dev/sdb, add the following line to the /etc/

sysconfig/rawdevices file:

/u02/orcl/system01.dbf /dev/sdb1

To activate the raw device, execute:

/etc/init.d/rawdevices start

Here is an example for creating raw devices for ASM:

# mknod /u02/oradata/asmdisks/disk01 c 162 1

# mknod /u02/oradata/asmdisks/disk02 c 162 2

# mknod /u02/oradata/asmdisks/disk03 c 162 3

# mknod /u02/oradata/asmdisks/disk03 c 162 4

# chown oracle.dba /u02/oradata/asmdisks/disk01

# chown oracle.dba /u02/oradata/asmdisks/disk02

# chown oracle.dba /u02/oradata/asmdisks/disk03

# chown oracle.dba /u02/oradata/asmdisks/disk04

# chmod 660 /u02/oradata/asmdisks/disk01

# chmod 660 /u02/oradata/asmdisks/disk02

# chmod 660 /u02/oradata/asmdisks/disk03

# chmod 660 /u02/oradata/asmdisks/disk04

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Red Hat ENTERPRISE LINUX AS 2.1 - Instalační příručka Strana 45