Xen users - Feb 2007 - Why I can not boot xen without initrd? Please help.

Hi.

I have SATA HDDs in software raid1 (mdadm). debian amd64
Why I cannot boot xen without initrd?
I get error:
VFS: Cannot open root device "md2" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(0,0)

Thank you for any help. I am getting crazy about this.

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because kernel to access the disk and your ext3, reiserfs etc... needs to
bem compiled with your ide-driver and sata driver and with your filesytem
driver.

if this is compiled in the kernel the you don''t need a initrd

if this is compiled as module, then you need a initrd to load the module,
because without the module you can''t access your disk to continue the
boot
process.

I am sorry for my bad english.



--------------------

Itamar Reis Peixoto

e-mail: itamar@ispbrasil.com.br
msn: itamarjp@starmedia.com
skype: itamarjp
icq: 81053601
+55 34 3238 3845
+55 11 4063 5033
----- Original Message ----- 
From: "kanour-xen" <xen@kanour.com>
To: <xen-users@lists.xensource.com>
Sent: Thursday, February 22, 2007 2:13 PM
Subject: [Xen-users] Why I can not boot xen without initrd? Please help.

> Hi.
>
> I have SATA HDDs in software raid1 (mdadm). debian amd64
> Why I cannot boot xen without initrd?
> I get error:
> VFS: Cannot open root device "md2" or unknown-block(0,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(0,0)
>
> Thank you for any help. I am getting crazy about this.
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

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On 2/22/07, kanour-xen <xen@kanour.com> wrote:
> Hi.
>
> I have SATA HDDs in software raid1 (mdadm). debian amd64
> Why I cannot boot xen without initrd?
Because the drivers for your m.b. disk controller were built into the
vanilla kernel, but not into xen''s?

jerry

-- 
"Pay no attention to that man behind the curtain!"

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kanour-xen wrote:
> Hi.
>
> I have SATA HDDs in software raid1 (mdadm). debian amd64
> Why I cannot boot xen without initrd?
> I get error:
> VFS: Cannot open root device "md2" or unknown-block(0,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(0,0)
>
> Thank you for any help. I am getting crazy about this.
Well, let''s see. Because the RAID, SATA, ext3, or other drivers were
not
hard-loaded into your kernel, but need to be present in an initrd to provide 
enough access to your file-system for you to boot?

The practice of preloading drivers versus module loading them, and usiing 
initrd to pre-loading modules, is an old well worth studying a bit about. 


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>
> I have SATA HDDs in software raid1 (mdadm). debian amd64
> Why I cannot boot xen without initrd?
> I get error:
> VFS: Cannot open root device "md2" or unknown-block(0,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(0,0)
Is native debian booting without an initrd?  Did you custom compile the debian 
kernel?

Cheers,
Mark

-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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