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[Xen-users] Diskless Xen (PXE, NFS, ...)

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Subject: [Xen-users] Diskless Xen (PXE, NFS, ...)
From: Thomas Treutner <thomas@xxxxxxxxxx>
Date: Wed, 28 Oct 2009 16:53:26 +0100
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I'd like to ask if someone has experience with setting up Xen (I use 3.2 from 
Lenny) in a diskless scenario - so not just the DomUs on a central storage 
(therefore, I use open-iscsi), but also Xen itself and the Dom0? 

I tried that because it would make adding nodes and other changings quite 
easy, and save disks. I used PXE (with mboot.c32) and NFS-Root, and it worked 
quite well after building a nfsroot capable initrd and considering that the 
network device used for nfsroot is not usable for building a bridge (without 
some initramfs customizations, I read) because the link will be lost when the 
bridge comes up.

But when I tried to live migrate DomUs between the nodes, I faced severe 
troubles. Migrations failed because, AFAIR, the block device frontend 
couldn't be disconnected? After that, I couldn't even get block device stats 
from libvirt...

Has anyone done such a setup, preferrably even with iSCSI, but without 
dedicated hardware such as HBAs etc.? Or does someone know a link to a howto? 
I've searched the mailing list and Google quite some time, and surprisingly, 
most people care only about central storage for domUs...

tia & kr,

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