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RE: [Xen-users] NFS Boot

To: "Abhishek Gaurav" <gaurav@xxxxxxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] NFS Boot
From: "Kraska, Joe A \(US SSA\)" <joe.kraska@xxxxxxxxxxxxxx>
Date: Mon, 26 Feb 2007 09:10:01 -0800
Delivery-date: Mon, 26 Feb 2007 09:55:30 -0800
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Thread-index: AcdZWP+Vm/jrOtiMSmKBCnRplGiKfQAb4SOg
Thread-topic: [Xen-users] NFS Boot
> I am new to xen and am trying to boot a VM from an NFS server. 
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(0,255)
> Please let me know what is that I am doing wrong.

Almost certainly do not have NFS_ROOT support compiled into your
kernel. Not sure, but think you might be able to bypass that if
you use the proper liturgy of invocations to your mkinitrd call.

BTW, if you are attempting to merely get live migration going, a
shared image file (through ordinary NFS sharing in the dom0) will
work fine.


p.s., "unknown block" comes up most often on my side of things
when the kernel doesn't quite understand how to grok the file
system that it is attempting to mount from; can happen because
of non-comprehension of SCSI, IDE, or NFS-based file systems all

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