NetVault 13.2 - Administration Guide

If you require /dev/raw/raw1 and /dev/raw/raw2, follow the same procedure using the proper numbers listed in the devices.txt file and set the same permissions.

Set up raw I/O on Red Hat Linux

The following example shows how to set up raw I/O on Red Hat Linux. The raw partition used is /dev/sda.

Calculate the number of 4096-byte pages in this partition, as shown in the following example:

fdisk /dev/sda

Disk /dev/sda: 255 heads, 63 sectors, 1106 cylinders

Units = cylinders of 16065 * 512 bytes

num_pages = floor( ((1106-524+1)*16065*512)/4096 )

num_pages = 11170736

Bind an unused raw device node to this partition. Binding is required each time the machine is rebooted. You must be logged in as root to run this command:

raw /dev/raw/raw1 /dev/sda

For persistent binding, open the /etc/sysconfig/rawdevices file and append the following line:

dev/raw/raw1 /dev/sda

Restart the system or type the following command:

/etc/rc.d/init.d/rawdevices start

Set appropriate read permissions on the raw device controller and the disk partition. Set appropriate read and write permissions on the raw device.

Set up raw I/O on Red Hat Enterprise Linux 5 or greater

The raw devices interface has been deprecated in Red Hat Enterprise Linux 5; the raw device mapping is now performed using udev rules. To correctly map the raw device, add the appropriate entries to the /etc/udev/rules.d/60‑raw.rules file in the following format:

•

For device names:

ACTION=="add", KERNEL=="<device name>", RUN+="/bin/raw /dev/raw/rawX %N"

•

For major or minor numbers:

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

Here <device name> is the name of the device that you want to bind (for example, /dev/sda1), A and B are the major or minor numbers of the device you want to bind, and X is the raw device number that you want the system to use.

If you have a large pre-existing /etc/sysconfig/rawdevices file, convert it using the following script.

#!/bin/sh

grep -v "^ *#" /etc/sysconfig/rawdevices | grep -v "^$" |

while read dev major minor;

if [-z “$minor”]; then

echo “ACTION==\”add\”, KERNEL==\”${major##/dev/}\”,

RUN+=\\”/bin/raw $dev%N\"“

else

echo “ACTION==\”add\”, ENV{MAJOR}==\”$major\”,

ENV{MINOR}==\”$minor\”, RUN+=\\”/

bin/raw $dev%M%m\”$dev%M%m\””

done

Set up raw I/O on SUSE Linux

On SUSE Linux, administer the raw disk partitions in the /etc/raw file. This plain text file contains comments and examples for possible configurations. After creating the raw devices, bind the raw devices by starting them with the script /etc/init.d/raw. Use the chkconfig(8) utility to ensure that the raw device binding occurs after any restart.

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