Configure raw in RedHat5

In versions earlier than RedHat5, the system configures the raw control file through/etc/sysconfig/rawdevices and manages the startup and shutdown of raw devices through/etc/init. d/rawdevices. After RedHat5, the original raw device interface has been canceled, and RedHat5 is configured through udev rules. To configure, edit the/etc/udev/rules. d/60-raw.rules file. The following is

In versions earlier than RedHat 5, the system configures the raw control file through/etc/sysconfig/rawdevices and manages the startup and shutdown of raw devices through/etc/init. d/rawdevices. After RedHat 5, the original raw device interface has been canceled, and RedHat 5 is configured through udev rules. To configure, edit the/etc/udev/rules. d/60-raw.rules file.

The following describes how to add a raw device.

1. Add a hard disk to the virtual machine. We only do the test, so the score is 10 MB.

2. Start our Vm and check the disk status after connecting it.

[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

The/dev/sdb is not formatted because it is a newly added hard disk.

3. Format/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.

View the formatted Hard Disk:

[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. Modify the/etc/udev/rules. d/60-raw.rules File

[Root @ centos ~] # More/etc/udev/rules. d/60-raw.rules

# Enter raw device bindings here.

#

# An example wocould 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.

Device Name:

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

Primary/secondary number:

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

Replace with the name of the device you want to bind(For example,/dev/sda1 ). "A" and "B" are the device's primary/secondary numbers, and X is the raw device number used by the system. The primary and secondary numbers are optional. If this parameter is not specified, the default value starts from,

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

Now that we know/dev/sdb1 to raw1, we can add the following content to the/etc/udev/rules. d/60-raw.rules file:

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