[轉]RedHat 5中裸裝置(raw)的配置

轉自：http://blog.csdn.net/tianlesoftware/article/details/5796962

在Redhat 5 之前的版本中，系統通過/etc/sysconfig/rawdevices配置raw的控制檔案，通過/etc/init.d/rawdevices來管理raw裝置的啟動和關閉。而在Redhat 5之後，原來的raw裝置介面已經取消了，redhat 5中通過udev規則進行配置。要配置，需要編輯/etc/udev/rules.d/60-raw.rules 這個檔案。

下面給出一個新增raw裝置的測試過程。

1.現在虛擬機器上新增一個硬碟。我們僅做測試，所以分10M。

2. 啟動我們的虛擬機器，連上後檢視磁碟情況

[root@centos ~]# fdisk -l

Disk /dev/sda: 16.1 GB, 16106127360 bytes

255 heads, 63 sectors/track, 1958 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sda1 * 201 1958 14121135 83 Linux

/dev/sda2 1 200 1606468+ 82 Linux swap / Solaris

Partition table entries are not in disk order

Disk /dev/sdb: 10 MB, 10485760 bytes

64 heads, 32 sectors/track, 10 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Disk /dev/sdb doesn't contain a valid partition table

這裡的/dev/sdb 因為是剛加上來的硬碟，還沒有格式化。

3. 格式化/dev/sdb

[root@centos ~]# fdisk /dev/sdb

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 (1-10, default 1):

Using default value 1

Last cylinder or +size or +sizeM or +sizeK (1-10, default 10):

Using default value 10

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

檢視格式化之後的硬碟情況：

[root@centos ~]# fdisk -l

Disk /dev/sda: 16.1 GB, 16106127360 bytes

255 heads, 63 sectors/track, 1958 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sda1 * 201 1958 14121135 83 Linux

/dev/sda2 1 200 1606468+ 82 Linux swap / Solaris

Partition table entries are not in disk order

Disk /dev/sdb: 10 MB, 10485760 bytes

64 heads, 32 sectors/track, 10 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Device Boot Start End Blocks Id System

/dev/sdb1 1 10 10224 83 Linux

[root@centos ~]#

4. 修改/etc/udev/rules.d/60-raw.rules檔案

[root@centos ~]# more /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.

裝置名稱：
ACTION=="add", KERNEL="", RUN+="/bin/raw /dev/raw/rawX %N"
主／次號碼：
ACTION=="add", ENV{MAJOR}="A", ENV{MINOR}="B", RUN+="/bin/raw /dev/raw/rawX %M %m"

用你需要繫結的裝置名稱替換（如：/dev/sda1）。"A" 和 "B" 是裝置的主／次號碼，X 是系統使用的 raw 裝置號碼。在設定的時候，主次號碼是可選的。如果不指定，預設從1，1開始，

如：/dev/raw/raw1: bound to major 1, minor 1

現在我們把/dev/sdb1 知道到raw1上，就可以在/etc/udev/rules.d/60-raw.rules檔案裡新增如下內容：

ACTION=="add", KERNEL=="sdb1",RUN+="/bin/raw /dev/raw/raw1 %N"

5. 重啟服務：
[root@centos ~]# start_udev

Starting udev: [ OK ]

6. 檢視raw裝置：
[root@centos ~]# ls -lrt /dev/raw

total 0

crw------- 1 root root 162, 1 Aug 8 06:56 raw1

[root@centos ~]# raw -aq

/dev/raw/raw1: bound to major 1, minor 1

如果我們新增了下面的語句：

ACTION=="add", ENV{MAJOR}=="8",ENV{MINOR}=="1",RUN+="/bin/raw /dev/raw/raw1 %M %m"

那麼就會顯示我們指定的Major和minor。

[root@centos ~]# ls -lrt /dev/raw

total 0

crw-rw---- 1 dave tianlesoftware 162, 1 Aug 8 08:06 raw1

[root@centos ~]# raw -aq

/dev/raw/raw1: bound to major 8, minor 1

7. 設定raw裝置的使用者和許可權資訊

在/etc/udev/rules.d/60-raw.rules檔案裡新增如下資訊：

ACTION=="add", KERNEL=="raw1", OWNER="dave", GROUP="tianlesoftware", MODE="660"

如果有多個raw裝置，可以寫成：

ACTION=="add", KERNEL=="raw[1-4]", OWNER="dave", GROUP="tianlesoftware", MODE="660"

在Oracle 中使用raw裝置時，如果裸裝置對應的屬組不是oracle，裸裝置將無法供oracle使用。

檢視結果：

[root@centos ~]# start_udev

Starting udev: [ OK ]

[root@centos ~]# ls -lrt /dev/raw

total 0

crw-rw---- 1 dave tianlesoftware 162, 1 Aug 8 06:59 raw1

[root@centos ~]# raw -aq

/dev/raw/raw1: bound to major 1, minor 1

8. 取消raw 對映

把major and minor設成0，就可以取消裸裝置的繫結。

[root@rac1 mapper]# raw /dev/raw/raw9 0 0

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/25744374/viewspace-773405/，如需轉載，請註明出處，否則將追究法律責任。

[轉]RedHat 5中裸裝置(raw)的配置

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