Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

I'm in the process of setting up RAID monitoring for a number of Dell servers that use the PERC 6i integrated card. We're using Nagios at present and the check_megasasctl plugin seems to fit the bill. However, the plugin relies upon the existence of:

/dev/megaraid_sas_ioctl_node

This device node doesn't exist by default, you have to create it by hand using something like:

mknod /dev/megaraid_sas_ioctl_node c 253 0

Now, to make the existence of this device node persistent across reboots, I thought I could write a udev rule, but as usual, I'm missing something. I thought I could create a file such as /etc/udev/rules.d/10-local/rules that contained:

DRIVER=="megasas" NAME="megaraid_sas_ioctl_node" MODE="0600"

But this doesn't work - no device node after a reboot. Dmesg output indicates the megasas driver is loaded and functional:

megasas: 00.00.04.01-RH1 Thu July 10 09:41:51 PST 2008
megasas: 0x1000:0x0060:0x1028:0x1f0c: bus 1:slot 0:func 0
megasas: FW now in Ready state

Further, I don't see any means to instruct udev on which type of device node to create: character or block. I suspect I'm failing to understand exactly how udev is meant to work.

I realise I could just cheat and run MegaCLI in /etc/rc.local, redirecting output to /dev/null; it creates the megaraid_sas_ioctl_node device node as part of its execution. I just thought using udev rules would be a) cleaner and b) a useful learning exercise. Perhaps I should just dump the above mknod command in /etc/rc.local...

So how do I get udev to create the /dev/megaraid_sas_ioctl_node device node based on the presence of the megasas driver?

Cheers

Steve

share|improve this question

1 Answer 1

up vote 1 down vote accepted

You'll need to run an external script to actually create the device node.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.