special device /dev/md0 does not exist

Slackovado · 01-27-2008, 05:07 AM

Ok, my nice new system is getting Slack 12 installed but I've got stuck on this raid thing

I have three sata hard drives.
First one has root on it and is the OS drive.
Then I have two hard drives dedicated to md0 and md1 to hold /home and /usr/local
All my file systems are xfs.
Now, the problem is that during boot the kernel is not assembling the raid and is not finding the /dev/md0 and /dev/md1 devices.
Isn't raid support compiled into the kernel?
It must be because the kernel is trying to make the raid.

I've refered to the following thred but the final post doesn't actually answer the questing if the kernel need to be recompiled and with what modifications.

http://www.linuxquestions.org/questi...highlight=raid

Can someone help?
Thanks

Alien Bob · 01-27-2008, 06:50 AM

In the thread you mention I said:

Quote:

OK after conferring with Patrick, PiterPUNK and Stuart Winter, this is the verdict:
Software RAID will work out of the box in Slackware (no initrd needed) if the following conditions are met:

- The raid drivers are compiled into the kernel (no modules!)
- The partition types are set to "Linux RAID Autodetect" (type 'fd')

Note that with RAID drivers as modules, the RAID autodetection by the kernel will fail.

And that is really all there is to say about it.

Eric

Slackovado · 01-27-2008, 07:23 AM

Quote:

Originally Posted by Alien Bob

In the thread you mention I said:

And that is really all there is to say about it.

Eric

Hehe,Ok.
I know I'm slow.

But I'm still asking myself.
Which raid drivers? The md?
And, so, are they compiled into the stock Slackware 12 kernel or not?

And my partitions are set to the raid auto detect.
But I get no md0 from kernel or udev.

For now I've set

Code:

mdadm -A --auto=md /dev/md0

right after udev load in rc.S
and that seems to work ok.
But I'd like to find a solution to this.
Is this a bug in Slackware?

Come on, you can tell me.
It'll stay just between us