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Re: [Xen-users] Centos + Xen 3.0 + Root on md = bad

To: larsks.21230602@xxxxxxxxxxxxx
Subject: Re: [Xen-users] Centos + Xen 3.0 + Root on md = bad
From: Taneli Leppä <taneli@xxxxxxxxxx>
Date: Thu, 15 Dec 2005 10:18:13 +0200
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Hi again,

larsks.21230602@xxxxxxxxxxxxx wrote:
That gives me two other questions:
(1) This is for the folks at Xensource responsible for the binary distribution
-- if md support under Xen requires the md drivers to be compiled into the
kernel, why does the binary distribution from Xensource have them built as

I believe they expected them to work - and they should work.
But they don't, for some reason. :-)

(2) I've tried adding mdadm to the initrd, and it complains that
/dev/md0 and /dev/md1 don't exist.  In fact, they *do* exist on the initrd
filesystem *prior* to starting udev; after udev starts I'm not positive (didn't
have much time to fiddle with it this morning).  Even running mdadm with 
fails to create the device nodes.  *Should* this work?  Or is it simply not
possible to use the md drivers built as modules under the Xen kernel?

Yeah, I believe it has something to do with either udev or
the modules themselves. All RAID autorun requires is a simple
ioctl() call to the md driver, but it's returning ENODEV. The
compiling in of modules is a good enough solution for me, so
I haven't looked more into this.

  Taneli Leppä         | Crasman Co Ltd
  <taneli@xxxxxxxxxx>  | <http://www.crasman.fi/>

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