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[Xen-devel] Race condition in /etc/xen/scripts/block

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Race condition in /etc/xen/scripts/block
From: Bastian de Groot <degroot@xxxxxxxxxxxxx>
Date: Fri, 16 Jul 2010 11:59:10 +0200
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I am trying to figure out the behavior of the hook-script for block devices 

Here is the problem:
I want to start a VM. It shall boot from a dm-device, which is setup by a  
script executed in the script /etc/xen/scripts/block. The dm-device doesn't  
exist when "xm start " is executed . 

When I place the setup script at the top of the block-script, everything  
works fine (http://pastebin.com/UYYbGupC). But when the script is placed in  
the phy case branch of the block-script, the VM won't start 

Whether the VM starts or not, also depends on the runtime of the setup script. 
When the script is executed fast, it is much more likely that the VM starts.

So, is there a way to setup a device in the hook-script?

My configuration: Xen 3.4 on a 2.6.32 Kernel

I would appreciate your help on that very much,

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