RedHat5中裸设备(raw)的配置

在RedHat 5 之前的版本中，系统通过/etc/sysconfig/rawdevices配置raw的控制文件，通过/etc/init.d/rawdevices来管理raw设备的启动和关闭。而在RedHat 5之后，原来的raw设备接口已经取消了，RedHat 5中通过udev规则进行配置。 要配置，需要编辑/etc/udev/rules.d/60-raw.rules 这个文件。

下面给出一个添加raw设备的测试过程。

1.现在虚拟机上添加一个硬盘。 我们仅做测试，所以分10M。

2. 启动我们的虚拟机，连上后查看磁盘情况

[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

这里的/dev/sdb 因为是刚加上来的硬盘，还没有格式化。

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.

查看格式化之后的硬盘情况：

[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文件

[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.

设备名称：

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

主／次号码：

ACTION=="add", ENV{MAJOR}="A", ENV{MINOR}="B", RUN+="/bin/raw /dev/raw/rawX %M %m"

用你需要绑定的设备名称替换 （如：/dev/sda1）。"A" 和 "B" 是设备的主／次号码，X 是系统使用的 raw 设备号码。在设置的时候，主次号码是可选的。 如果不指定，默认从1，1开始，

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

现在我们把/dev/sdb1 知道到raw1上，就可以在/etc/udev/rules.d/60-raw.rules文件里添加如下内容：

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