環境
系統環境
[root@node1 ~]# uname -a
Linux node1 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:43 EDT 2010 i686 i686 i386 GNU/Linux
[root@node1 ~]# more /etc/redhat-release
Red Hat Enterprise Linux Server release 5.5 (Tikanga)
[root@node1 ~]#
oracle環境
SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

檢視磁碟
[root@node1 ~]# fdisk -l
Disk /dev/sda: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 2610 20860402+ 8e Linux LVM

Disk /dev/sdb: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 2610 20964793+ 83 Linux

Disk /dev/sdc: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdc doesn't contain a valid partition table
給/dev/sdc 劃分一個1g的分割槽用作裸裝置
[root@node1 ~]# fdisk /dev/sdc
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): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)

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): +1024M

Command (m for help): p
Disk /dev/sdc: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdc1 1 125 1004031 83 Linux

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

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

修改/etc/udev/rules.d/60-raw.rules 檔案
[root@node1 ~]# vi /etc/udev/rules.d/60-raw.rules
# Enter raw device bindings here.
#
# An example would be:
# ACTION=="add", KERNEL=="sda", RUN+="/bin/raw /dev/raw/raw1 %N"
# to bind /dev/raw/raw1 to /dev/sda, or
# ACTION=="add", ENV{MAJOR}=="8", ENV{MINOR}=="1", RUN+="/bin/raw /dev/raw/raw2 %M %m"
# to bind /dev/raw/raw2 to the device with major 8, minor 1.

ACTION=="add", KERNEL=="sdc1", RUN+="/bin/raw /dev/raw/raw1 %N"
ACTION=="add", KERNEL=="sdc2", RUN+="/bin/raw /dev/raw/raw2 %N"

ACTION=="add", ENV{MAJOR}=="3", ENV{MINOR}=="1", RUN+="/bin/raw /dev/raw/raw1 %M %m"
ACTION=="add", ENV{MAJOR}=="7", ENV{MINOR}=="1", RUN+="/bin/raw /dev/raw/raw2 %M %m"
~

啟動裸裝置
[root@node1 ~]# start_udev
Starting udev: [ OK ]
[root@node1 ~]#
修改裸裝置的主裝置號和復裝置號
[root@node1 ~]# raw -qa
/dev/raw/raw1: bound to major 8, minor 33
[root@node1 ~]# raw /dev/raw/raw1 1 1
/dev/raw/raw1: bound to major 1, minor 1
[root@node1 ~]# raw -qa
/dev/raw/raw1: bound to major 1, minor 1
刪除裸裝置，當然還必須修改/etc/udev/rules.d/60-raw.rules 檔案
[root@node1 ~]# raw /dev/raw/raw1 0 0
/dev/raw/raw1: bound to major 0, minor 0
[root@node1 ~]# raw -qa
[root@node1 ~]# raw /dev/raw/raw1 1 1
/dev/raw/raw1: bound to major 1, minor 1
[root@node1 ~]# raw -qa
/dev/raw/raw1: bound to major 1, minor 1

修改裸裝置的許可權
[root@node1 ~]# raw -qa
/dev/raw/raw1: bound to major 8, minor 33
/dev/raw/raw2: bound to major 8, minor 34
[root@node1 ~]# cd /dev/raw
[root@node1 raw]# ls -l
total 0
crw------- 1 root root 162, 1 Apr 7 18:03 raw1
crw------- 1 root root 162, 2 Apr 7 18:03 raw2
[root@node1 raw]# chown oracle:oinstall raw1
[root@node1 raw]# chown oracle:oinstall raw2
[root@node1 raw]# chmod 775 raw1 raw2
[root@node1 raw]# ls -l
total 0
crwxrwxr-x 1 oracle oinstall 162, 1 Apr 7 18:03 raw1
crwxrwxr-x 1 oracle oinstall 162, 2 Apr 7 18:03 raw2
檢視裸裝置的可用空間
[root@node1 raw]# blockdev --getsize /dev/raw/raw1
2008062
[root@node1 raw]# blockdev --getsize /dev/raw/raw2
2008125

2008125*512/1024/1024=980M

在oracle中新增裸裝置為資料檔案的表空間
SQL> create tablespace tbs_raw datafile'/dev/raw/raw1' size 950m;
Tablespace created.

linux 使用裸裝置建立表空間

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