[one-users] VM stuck in "migration" state - migration never issued(Xen)

[Alberto Zuin - Liste]

You can tail sched.log, to see if the scheduler puts the VM in migrate 
mode... but I don't think this can help you a lot.
I just resoved a similar issue on my installation with xen: originally I 
didn't set a fixed memory for Dom0 and, then, OpenNebula monitor didn't 
recognize the real amount of free ram on the host: in fact OpenNebula 
thinked the host was full of ram because Linux Bufferization and, then, 
didn't migrate the VM.
You can check this via onehost list command: if you see a small amount of 
RAM, less than VM RAM, this is the problem.
Hope this can help you,
Alberto Zuin

http://www.azns.it



----- Original Message ----- 
From: "Thomas Knauth" <thomas.knauth at gmx.de>
To: <users at lists.opennebula.org>
Sent: Monday, June 27, 2011 11:23 PM
Subject: [one-users] VM stuck in "migration" state - migration never 
issued(Xen)


> Hello list,
>
> I am experiencing very long delays (>15min) between issuing $ onevm
> livemigrate ... and the actual migration taking place. Which parts of
> ONE are taking part in the decision when to migrate?
>
> The log file of the VM says
>
> Mon Jun 27 17:33:57 2011 [LCM][I]: New VM state is MIGRATE
>
> but nothing happens. Migrations do work in general. Sometimes. When it
> does not work, the
> command "xm -l ..." (using Xen) is never executed on the host the VM
> is running on (as can be confirmed by looking into /var/log/auth.log).
>
> Which parts of ONE are involved when I issue the "onevm livemigrate"
> command from the console? Where can I get more debug info to
> troubleshoot the problem?
>
> Thanks in advance,
> Thomas.
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