udev, create raw disk device, how?
 

Hello,

How do I create a raw disk device under RHES 5? Sybase wants raw disk space.

Under ver. 4 I used to to the following
1. create the dir. /dev/raw
2. mknod /dev/raw/raw1 c 162 1
3. raw /dev/raw/raw1 /dev/sdc1
4. edit the /etc/udev/permissions.d/50-udev.permissions file and assign the device to sybase.
5. edit the file /etc/sysconfig/rawdevices with the line
/dev/raw/raw1 /dev/sdc1
6. run /etc/init.d/rawdevices
7. do a chkconfig rawdevices on

The first 3 steps would create the raw devices. The remaining steps made sure they would return after a reboot.

Under 5 I've found out that I'm only supposed to use udev and add the line

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

to the file /etc/udev/rules.d/50-raw.rules and thats it.
There is no mention of the permissions.d dir or anything else.

after a reboot my /dev/raw dir goes away and does not return. What am I missing

Thank you
Thomas L. Gossard

/dev as you have seen is dynamically managed. If you want a mknod'd file to show up in /dev persistently, you need to place it inside of /lib/udev/devices.

Check this knowledge base article ;

http://kbase.redhat.com/faq/FAQ_105_9616.shtm